<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2024 Workiva-->
<!--r:a3a9a5bd-4848-4f63-8f86-db4638531531,g:544c74c7-c996-40a7-ba27-4296477d8ff3-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.xyleminc.com/role/CondensedConsolidatedIncomeStatementsUnaudited" xlink:type="simple" xlink:href="xyl-20240930.xsd#CondensedConsolidatedIncomeStatementsUnaudited"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/CondensedConsolidatedIncomeStatementsUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_9d77aa4b-be32-4671-875b-3d474b457910" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_f5135abe-4f1c-464c-b843-64e4a87bfb73" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_9d77aa4b-be32-4671-875b-3d474b457910" xlink:to="loc_us-gaap_StatementTable_f5135abe-4f1c-464c-b843-64e4a87bfb73" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_1d03777b-b20f-4f23-bf16-5a55a77afd74" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_f5135abe-4f1c-464c-b843-64e4a87bfb73" xlink:to="loc_srt_ProductOrServiceAxis_1d03777b-b20f-4f23-bf16-5a55a77afd74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_1d03777b-b20f-4f23-bf16-5a55a77afd74_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_1d03777b-b20f-4f23-bf16-5a55a77afd74" xlink:to="loc_srt_ProductsAndServicesDomain_1d03777b-b20f-4f23-bf16-5a55a77afd74_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_189f75e4-d52d-48d8-9ab9-1194531cfa35" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_1d03777b-b20f-4f23-bf16-5a55a77afd74" xlink:to="loc_srt_ProductsAndServicesDomain_189f75e4-d52d-48d8-9ab9-1194531cfa35" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductMember_15000283-c727-47df-acd2-18705ef1a0d2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProductMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_189f75e4-d52d-48d8-9ab9-1194531cfa35" xlink:to="loc_us-gaap_ProductMember_15000283-c727-47df-acd2-18705ef1a0d2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServiceMember_0f2b6466-8cf6-4f32-a801-07c78c310ab7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_189f75e4-d52d-48d8-9ab9-1194531cfa35" xlink:to="loc_us-gaap_ServiceMember_0f2b6466-8cf6-4f32-a801-07c78c310ab7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_8524dd88-d634-4e29-bd62-149050e5a4b9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9d77aa4b-be32-4671-875b-3d474b457910" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_8524dd88-d634-4e29-bd62-149050e5a4b9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenue_f528f1b9-215b-4323-b779-a78d0011d89f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostOfRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9d77aa4b-be32-4671-875b-3d474b457910" xlink:to="loc_us-gaap_CostOfRevenue_f528f1b9-215b-4323-b779-a78d0011d89f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_0fee98a1-94b5-4374-ab73-e091fbffd4c1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9d77aa4b-be32-4671-875b-3d474b457910" xlink:to="loc_us-gaap_GrossProfit_0fee98a1-94b5-4374-ab73-e091fbffd4c1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_9df18822-b826-4562-adcd-da9117fc32f0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9d77aa4b-be32-4671-875b-3d474b457910" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_9df18822-b826-4562-adcd-da9117fc32f0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_ee476b1d-840c-4113-b30c-1abd30f3b438" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9d77aa4b-be32-4671-875b-3d474b457910" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_ee476b1d-840c-4113-b30c-1abd30f3b438" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_RestructuringAndAssetImpairmentLosses_17383822-36a3-490a-a32e-26202b4c4c44" xlink:href="xyl-20240930.xsd#xyl_RestructuringAndAssetImpairmentLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9d77aa4b-be32-4671-875b-3d474b457910" xlink:to="loc_xyl_RestructuringAndAssetImpairmentLosses_17383822-36a3-490a-a32e-26202b4c4c44" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_ab3a7c55-74fd-437a-8e23-524d4eaf7b16" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9d77aa4b-be32-4671-875b-3d474b457910" xlink:to="loc_us-gaap_OperatingIncomeLoss_ab3a7c55-74fd-437a-8e23-524d4eaf7b16" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_f83a5d5a-9a2f-4456-a213-eb20eb8a0a83" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9d77aa4b-be32-4671-875b-3d474b457910" xlink:to="loc_us-gaap_InterestExpenseNonoperating_f83a5d5a-9a2f-4456-a213-eb20eb8a0a83" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_5867e78a-b130-4784-9ea8-d2e4277b88ef" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9d77aa4b-be32-4671-875b-3d474b457910" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_5867e78a-b130-4784-9ea8-d2e4277b88ef" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfBusiness_de5a04a2-9f10-4481-b7e5-6b7f645741bb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GainLossOnSaleOfBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9d77aa4b-be32-4671-875b-3d474b457910" xlink:to="loc_us-gaap_GainLossOnSaleOfBusiness_de5a04a2-9f10-4481-b7e5-6b7f645741bb" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_62e723f2-dbd6-44fc-8d24-679bbce0beb5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9d77aa4b-be32-4671-875b-3d474b457910" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_62e723f2-dbd6-44fc-8d24-679bbce0beb5" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_303a8353-ed89-4455-a347-af065a2c7227" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9d77aa4b-be32-4671-875b-3d474b457910" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_303a8353-ed89-4455-a347-af065a2c7227" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_a78d2e04-0f25-4002-86de-f65f0ca12751" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9d77aa4b-be32-4671-875b-3d474b457910" xlink:to="loc_us-gaap_ProfitLoss_a78d2e04-0f25-4002-86de-f65f0ca12751" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareAbstract_c7130972-5e01-4664-a6a0-f80e31ad1cd4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EarningsPerShareAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9d77aa4b-be32-4671-875b-3d474b457910" xlink:to="loc_us-gaap_EarningsPerShareAbstract_c7130972-5e01-4664-a6a0-f80e31ad1cd4" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_5e038f9c-4f45-4476-b7bb-84a8485a7782" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_c7130972-5e01-4664-a6a0-f80e31ad1cd4" xlink:to="loc_us-gaap_EarningsPerShareBasic_5e038f9c-4f45-4476-b7bb-84a8485a7782" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_3b5c3c88-fb58-4c03-88ad-54e4630e35db" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_c7130972-5e01-4664-a6a0-f80e31ad1cd4" xlink:to="loc_us-gaap_EarningsPerShareDiluted_3b5c3c88-fb58-4c03-88ad-54e4630e35db" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_e8e05622-03d1-4b52-b3a5-4a385adbf87b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9d77aa4b-be32-4671-875b-3d474b457910" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_e8e05622-03d1-4b52-b3a5-4a385adbf87b" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_a21c23fa-6441-4ee6-a842-70235bae043a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_e8e05622-03d1-4b52-b3a5-4a385adbf87b" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_a21c23fa-6441-4ee6-a842-70235bae043a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_948f2faf-5377-4505-9633-e8c6cd0e1f6e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_e8e05622-03d1-4b52-b3a5-4a385adbf87b" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_948f2faf-5377-4505-9633-e8c6cd0e1f6e" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/RecentlyIssuedAccountingPronouncementsTextualsDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#RecentlyIssuedAccountingPronouncementsTextualsDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/RecentlyIssuedAccountingPronouncementsTextualsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_23baf2c9-8b67-4488-bc68-ffb0bff095c4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_4b50e49f-d449-4e62-b37c-bf7ed6949ace" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_23baf2c9-8b67-4488-bc68-ffb0bff095c4" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_4b50e49f-d449-4e62-b37c-bf7ed6949ace" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_fbc4eeae-9bad-45d0-98dc-68c7571507b2" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_4b50e49f-d449-4e62-b37c-bf7ed6949ace" xlink:to="loc_srt_RangeAxis_fbc4eeae-9bad-45d0-98dc-68c7571507b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_fbc4eeae-9bad-45d0-98dc-68c7571507b2_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_fbc4eeae-9bad-45d0-98dc-68c7571507b2" xlink:to="loc_srt_RangeMember_fbc4eeae-9bad-45d0-98dc-68c7571507b2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_4e9dad13-f978-47f4-a178-38dd5578d678" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_fbc4eeae-9bad-45d0-98dc-68c7571507b2" xlink:to="loc_srt_RangeMember_4e9dad13-f978-47f4-a178-38dd5578d678" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_53a81da9-ce18-4465-b353-c8320aacd44d" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_4e9dad13-f978-47f4-a178-38dd5578d678" xlink:to="loc_srt_MinimumMember_53a81da9-ce18-4465-b353-c8320aacd44d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_5868e5d0-97cb-4143-af00-3e1ace364d9e" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_4e9dad13-f978-47f4-a178-38dd5578d678" xlink:to="loc_srt_MaximumMember_5868e5d0-97cb-4143-af00-3e1ace364d9e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_PurchaseObligationSupplierFinanceProgramPaymentTermsOfInvoice_c3814d1d-b9e6-4b18-98a8-bc4fa6ceb880" xlink:href="xyl-20240930.xsd#xyl_PurchaseObligationSupplierFinanceProgramPaymentTermsOfInvoice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_23baf2c9-8b67-4488-bc68-ffb0bff095c4" xlink:to="loc_xyl_PurchaseObligationSupplierFinanceProgramPaymentTermsOfInvoice_c3814d1d-b9e6-4b18-98a8-bc4fa6ceb880" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_PurchaseObligationSupplierFinanceProgramTerminationNoticeRequired_03c7181b-6aa6-4e44-a159-a0c6f67e8b30" xlink:href="xyl-20240930.xsd#xyl_PurchaseObligationSupplierFinanceProgramTerminationNoticeRequired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_23baf2c9-8b67-4488-bc68-ffb0bff095c4" xlink:to="loc_xyl_PurchaseObligationSupplierFinanceProgramTerminationNoticeRequired_03c7181b-6aa6-4e44-a159-a0c6f67e8b30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligation_76d7eed7-29e9-4bca-909d-ebc2593a1ec0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PurchaseObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_23baf2c9-8b67-4488-bc68-ffb0bff095c4" xlink:to="loc_us-gaap_PurchaseObligation_76d7eed7-29e9-4bca-909d-ebc2593a1ec0" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/AcquisitionsandDivestituresTextualsDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#AcquisitionsandDivestituresTextualsDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/AcquisitionsandDivestituresTextualsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_ba746938-ac6e-402b-907f-da03041c41e2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_9b295d8b-e01d-42d1-bcd6-e50134379d1c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba746938-ac6e-402b-907f-da03041c41e2" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_9b295d8b-e01d-42d1-bcd6-e50134379d1c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_1a9a94d1-4da3-42d0-8d9f-e94e1e592946" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_9b295d8b-e01d-42d1-bcd6-e50134379d1c" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_1a9a94d1-4da3-42d0-8d9f-e94e1e592946" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1a9a94d1-4da3-42d0-8d9f-e94e1e592946_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_1a9a94d1-4da3-42d0-8d9f-e94e1e592946" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1a9a94d1-4da3-42d0-8d9f-e94e1e592946_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_fe56b773-b8da-437b-97dd-5562367e3318" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_1a9a94d1-4da3-42d0-8d9f-e94e1e592946" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_fe56b773-b8da-437b-97dd-5562367e3318" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_EvoquaAcquisitionMember_71da3165-b86d-4bd3-9383-48c264afdf3b" xlink:href="xyl-20240930.xsd#xyl_EvoquaAcquisitionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_fe56b773-b8da-437b-97dd-5562367e3318" xlink:to="loc_xyl_EvoquaAcquisitionMember_71da3165-b86d-4bd3-9383-48c264afdf3b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_5a73f307-a604-4dfa-bc99-549995a02869" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_9b295d8b-e01d-42d1-bcd6-e50134379d1c" xlink:to="loc_srt_OwnershipAxis_5a73f307-a604-4dfa-bc99-549995a02869" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_5a73f307-a604-4dfa-bc99-549995a02869_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_5a73f307-a604-4dfa-bc99-549995a02869" xlink:to="loc_srt_OwnershipDomain_5a73f307-a604-4dfa-bc99-549995a02869_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_96ecde6c-0888-4f52-b6ba-4449af2645ef" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_5a73f307-a604-4dfa-bc99-549995a02869" xlink:to="loc_srt_OwnershipDomain_96ecde6c-0888-4f52-b6ba-4449af2645ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_LegacyEvoquaStockholdersMember_1e1c2700-1c13-4f1f-bc6b-e8a48f7ec689" xlink:href="xyl-20240930.xsd#xyl_LegacyEvoquaStockholdersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_96ecde6c-0888-4f52-b6ba-4449af2645ef" xlink:to="loc_xyl_LegacyEvoquaStockholdersMember_1e1c2700-1c13-4f1f-bc6b-e8a48f7ec689" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_LegacyXylemStockholdersMember_1213a965-169d-432e-b37e-f2babd36d6bc" xlink:href="xyl-20240930.xsd#xyl_LegacyXylemStockholdersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_96ecde6c-0888-4f52-b6ba-4449af2645ef" xlink:to="loc_xyl_LegacyXylemStockholdersMember_1213a965-169d-432e-b37e-f2babd36d6bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_3a2d1bed-89fe-4a92-aadb-0411106665dd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_9b295d8b-e01d-42d1-bcd6-e50134379d1c" xlink:to="loc_us-gaap_StatementClassOfStockAxis_3a2d1bed-89fe-4a92-aadb-0411106665dd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_3a2d1bed-89fe-4a92-aadb-0411106665dd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_3a2d1bed-89fe-4a92-aadb-0411106665dd" xlink:to="loc_us-gaap_ClassOfStockDomain_3a2d1bed-89fe-4a92-aadb-0411106665dd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_d5f5b761-2e22-45ad-878e-977296663fe8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_3a2d1bed-89fe-4a92-aadb-0411106665dd" xlink:to="loc_us-gaap_ClassOfStockDomain_d5f5b761-2e22-45ad-878e-977296663fe8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockOptionMember_38fee7a4-dc57-461c-a21c-5942cb595d51" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_d5f5b761-2e22-45ad-878e-977296663fe8" xlink:to="loc_us-gaap_StockOptionMember_38fee7a4-dc57-461c-a21c-5942cb595d51" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_70138252-8d94-4648-b9f1-183e222246c7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_d5f5b761-2e22-45ad-878e-977296663fe8" xlink:to="loc_us-gaap_PerformanceSharesMember_70138252-8d94-4648-b9f1-183e222246c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_53243401-9a52-4416-9085-d33f300dd52a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_d5f5b761-2e22-45ad-878e-977296663fe8" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_53243401-9a52-4416-9085-d33f300dd52a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_b8997849-9b45-4c9d-85a6-d1a9a5af86f6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_9b295d8b-e01d-42d1-bcd6-e50134379d1c" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_b8997849-9b45-4c9d-85a6-d1a9a5af86f6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_b8997849-9b45-4c9d-85a6-d1a9a5af86f6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_b8997849-9b45-4c9d-85a6-d1a9a5af86f6" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_b8997849-9b45-4c9d-85a6-d1a9a5af86f6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_ea7662d0-0692-4278-8632-9d70b97f7278" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_b8997849-9b45-4c9d-85a6-d1a9a5af86f6" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_ea7662d0-0692-4278-8632-9d70b97f7278" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_6417328e-b489-405e-a855-fbb479daacbd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_ea7662d0-0692-4278-8632-9d70b97f7278" xlink:to="loc_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_6417328e-b489-405e-a855-fbb479daacbd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_79d448b0-11c2-428d-bd94-6311203164b9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_9b295d8b-e01d-42d1-bcd6-e50134379d1c" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_79d448b0-11c2-428d-bd94-6311203164b9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_79d448b0-11c2-428d-bd94-6311203164b9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_79d448b0-11c2-428d-bd94-6311203164b9" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_79d448b0-11c2-428d-bd94-6311203164b9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_c81fd373-a1c7-4598-8a9e-f664cdf5ddb6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_79d448b0-11c2-428d-bd94-6311203164b9" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_c81fd373-a1c7-4598-8a9e-f664cdf5ddb6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_EvoquaCarbonReactivationAndSlurryOperationsMember_61f2c44e-929d-4e3c-ae4d-d3a985fdb831" xlink:href="xyl-20240930.xsd#xyl_EvoquaCarbonReactivationAndSlurryOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_c81fd373-a1c7-4598-8a9e-f664cdf5ddb6" xlink:to="loc_xyl_EvoquaCarbonReactivationAndSlurryOperationsMember_61f2c44e-929d-4e3c-ae4d-d3a985fdb831" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_EvoquaHemodialysisConcentratesBusinessMember_0a984fc5-7c24-45c2-a681-1f7c0c2f0faa" xlink:href="xyl-20240930.xsd#xyl_EvoquaHemodialysisConcentratesBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_c81fd373-a1c7-4598-8a9e-f664cdf5ddb6" xlink:to="loc_xyl_EvoquaHemodialysisConcentratesBusinessMember_0a984fc5-7c24-45c2-a681-1f7c0c2f0faa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableEntitySharesIssuedPerAcquireeShare_8e3d7401-b040-4085-ba7f-251fd92f0b69" xlink:href="xyl-20240930.xsd#xyl_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableEntitySharesIssuedPerAcquireeShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba746938-ac6e-402b-907f-da03041c41e2" xlink:to="loc_xyl_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableEntitySharesIssuedPerAcquireeShare_8e3d7401-b040-4085-ba7f-251fd92f0b69" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_dfe99f24-2a1c-40d9-b61c-fe0940e96a18" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba746938-ac6e-402b-907f-da03041c41e2" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_dfe99f24-2a1c-40d9-b61c-fe0940e96a18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_171ca1cd-28dc-4edd-9036-045d9352fd2c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba746938-ac6e-402b-907f-da03041c41e2" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_171ca1cd-28dc-4edd-9036-045d9352fd2c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_30753062-fcb6-49f0-b486-9543d3985ffc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba746938-ac6e-402b-907f-da03041c41e2" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_30753062-fcb6-49f0-b486-9543d3985ffc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_BusinessCombinationConsiderationTransferredLiabilitiesPaid_5efadd61-2bc5-4b75-804a-b2ae7bc117fa" xlink:href="xyl-20240930.xsd#xyl_BusinessCombinationConsiderationTransferredLiabilitiesPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba746938-ac6e-402b-907f-da03041c41e2" xlink:to="loc_xyl_BusinessCombinationConsiderationTransferredLiabilitiesPaid_5efadd61-2bc5-4b75-804a-b2ae7bc117fa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_253bcf2a-e4e4-41f4-947f-12b82f661f06" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba746938-ac6e-402b-907f-da03041c41e2" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_253bcf2a-e4e4-41f4-947f-12b82f661f06" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_3603dfdc-312f-496d-a91d-1a4b502da26e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_MinorityInterestOwnershipPercentageByParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba746938-ac6e-402b-907f-da03041c41e2" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_3603dfdc-312f-496d-a91d-1a4b502da26e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_BusinessCombinationConsiderationTransferredEquityInterestIssuedAndIssuableReplacementEquityAwards_6929a246-6ff4-45e1-9886-a94d4b0f9719" xlink:href="xyl-20240930.xsd#xyl_BusinessCombinationConsiderationTransferredEquityInterestIssuedAndIssuableReplacementEquityAwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba746938-ac6e-402b-907f-da03041c41e2" xlink:to="loc_xyl_BusinessCombinationConsiderationTransferredEquityInterestIssuedAndIssuableReplacementEquityAwards_6929a246-6ff4-45e1-9886-a94d4b0f9719" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNet_36db8425-c73d-44bd-ae2c-b724ccc844cf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccountsReceivableNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba746938-ac6e-402b-907f-da03041c41e2" xlink:to="loc_us-gaap_AccountsReceivableNet_36db8425-c73d-44bd-ae2c-b724ccc844cf" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableGross_78f9ba69-c4e5-49f6-90e3-e3a68852c683" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccountsReceivableGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba746938-ac6e-402b-907f-da03041c41e2" xlink:to="loc_us-gaap_AccountsReceivableGross_78f9ba69-c4e5-49f6-90e3-e3a68852c683" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivable_0ea2d922-e76d-47b2-875c-01250fa1101c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba746938-ac6e-402b-907f-da03041c41e2" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivable_0ea2d922-e76d-47b2-875c-01250fa1101c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_2c745f95-cae1-43bc-ac79-8dfd7a98d0a4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba746938-ac6e-402b-907f-da03041c41e2" xlink:to="loc_us-gaap_Goodwill_2c745f95-cae1-43bc-ac79-8dfd7a98d0a4" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_33cd58be-3119-4434-9b6f-b5995faae6bf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba746938-ac6e-402b-907f-da03041c41e2" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_33cd58be-3119-4434-9b6f-b5995faae6bf" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_e174d932-6905-4bed-9cec-9025e819fdbd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba746938-ac6e-402b-907f-da03041c41e2" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_e174d932-6905-4bed-9cec-9025e819fdbd" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_e624d7ac-8ead-467c-a093-f49da8651045" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba746938-ac6e-402b-907f-da03041c41e2" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_e624d7ac-8ead-467c-a093-f49da8651045" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_f7f09398-c121-42fc-ba4b-fa34ee651a1a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProceedsFromDivestitureOfBusinesses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba746938-ac6e-402b-907f-da03041c41e2" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_f7f09398-c121-42fc-ba4b-fa34ee651a1a" xlink:type="arc" order="15"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/AcquisitionsandDivestituresPurchasePriceAllocationDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#AcquisitionsandDivestituresPurchasePriceAllocationDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/AcquisitionsandDivestituresPurchasePriceAllocationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_ba3fa804-ce12-412b-a0d3-17609c9f2192" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_32fcbf74-61f4-4228-a8f7-905eb0e56e46" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba3fa804-ce12-412b-a0d3-17609c9f2192" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_32fcbf74-61f4-4228-a8f7-905eb0e56e46" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_661933da-7b41-43b7-aebc-71c8884c7a84" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_32fcbf74-61f4-4228-a8f7-905eb0e56e46" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_661933da-7b41-43b7-aebc-71c8884c7a84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_661933da-7b41-43b7-aebc-71c8884c7a84_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_661933da-7b41-43b7-aebc-71c8884c7a84" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_661933da-7b41-43b7-aebc-71c8884c7a84_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_31414348-94dd-4163-89c2-b654f3469959" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_661933da-7b41-43b7-aebc-71c8884c7a84" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_31414348-94dd-4163-89c2-b654f3469959" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_EvoquaAcquisitionMember_6bd95e79-6597-4dd9-a950-91155e319791" xlink:href="xyl-20240930.xsd#xyl_EvoquaAcquisitionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_31414348-94dd-4163-89c2-b654f3469959" xlink:to="loc_xyl_EvoquaAcquisitionMember_6bd95e79-6597-4dd9-a950-91155e319791" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_80459ee8-e1fb-4ea7-8c8f-8db3a95f5d0a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba3fa804-ce12-412b-a0d3-17609c9f2192" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_80459ee8-e1fb-4ea7-8c8f-8db3a95f5d0a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_ec5c7a1c-a0d0-4cef-9084-363de2b301d0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba3fa804-ce12-412b-a0d3-17609c9f2192" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_ec5c7a1c-a0d0-4cef-9084-363de2b301d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_36c8f902-4cf7-4296-9fd7-b4de42d6d28d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba3fa804-ce12-412b-a0d3-17609c9f2192" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_36c8f902-4cf7-4296-9fd7-b4de42d6d28d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_a3a38791-5625-4358-ae8d-c0d14e9e343e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba3fa804-ce12-412b-a0d3-17609c9f2192" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_a3a38791-5625-4358-ae8d-c0d14e9e343e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsHeldForSale_f898870f-ecd3-477b-ab72-8d5de5b4f1f6" xlink:href="xyl-20240930.xsd#xyl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba3fa804-ce12-412b-a0d3-17609c9f2192" xlink:to="loc_xyl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsHeldForSale_f898870f-ecd3-477b-ab72-8d5de5b4f1f6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_5e3c8ab8-ecdb-4ec2-ba41-e1ca7ac100d7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba3fa804-ce12-412b-a0d3-17609c9f2192" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_5e3c8ab8-ecdb-4ec2-ba41-e1ca7ac100d7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_22fc8384-fb8d-43e9-a161-7971829ebdf2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba3fa804-ce12-412b-a0d3-17609c9f2192" xlink:to="loc_us-gaap_Goodwill_22fc8384-fb8d-43e9-a161-7971829ebdf2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_4d647254-14c3-4176-99b4-73149eb61e3d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba3fa804-ce12-412b-a0d3-17609c9f2192" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_4d647254-14c3-4176-99b4-73149eb61e3d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_474fafe4-1fc2-48ed-af2c-0ff605819c0c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba3fa804-ce12-412b-a0d3-17609c9f2192" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_474fafe4-1fc2-48ed-af2c-0ff605819c0c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentAssetsHeldForSale_063764bf-0a98-4724-a5c1-e82493b9179f" xlink:href="xyl-20240930.xsd#xyl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentAssetsHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba3fa804-ce12-412b-a0d3-17609c9f2192" xlink:to="loc_xyl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentAssetsHeldForSale_063764bf-0a98-4724-a5c1-e82493b9179f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_5d795435-5b94-4ffc-94ff-5bd83f90b061" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba3fa804-ce12-412b-a0d3-17609c9f2192" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_5d795435-5b94-4ffc-94ff-5bd83f90b061" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt_e12f4c30-6198-474a-8c1b-4e1979f3a76e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba3fa804-ce12-412b-a0d3-17609c9f2192" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt_e12f4c30-6198-474a-8c1b-4e1979f3a76e" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedExpensesAndOtherLiabilities_f5f0bece-a3e3-4201-b4ec-b384569c3b2b" xlink:href="xyl-20240930.xsd#xyl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedExpensesAndOtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba3fa804-ce12-412b-a0d3-17609c9f2192" xlink:to="loc_xyl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedExpensesAndOtherLiabilities_f5f0bece-a3e3-4201-b4ec-b384569c3b2b" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesHeldForSale_c28e1296-e3de-4dea-8f5f-e259f209562f" xlink:href="xyl-20240930.xsd#xyl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba3fa804-ce12-412b-a0d3-17609c9f2192" xlink:to="loc_xyl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesHeldForSale_c28e1296-e3de-4dea-8f5f-e259f209562f" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_ecec4344-935c-452b-91bc-3eaf0a7deca9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba3fa804-ce12-412b-a0d3-17609c9f2192" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_ecec4344-935c-452b-91bc-3eaf0a7deca9" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_d195ad13-8a9b-4579-9015-173a5c8afe93" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba3fa804-ce12-412b-a0d3-17609c9f2192" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_d195ad13-8a9b-4579-9015-173a5c8afe93" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_ac5d82af-2e49-4a65-a4d7-d4ed102ffe0a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba3fa804-ce12-412b-a0d3-17609c9f2192" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_ac5d82af-2e49-4a65-a4d7-d4ed102ffe0a" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesHeldForSale_2c394c33-61c0-40bc-8cae-f5659777cef7" xlink:href="xyl-20240930.xsd#xyl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba3fa804-ce12-412b-a0d3-17609c9f2192" xlink:to="loc_xyl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesHeldForSale_2c394c33-61c0-40bc-8cae-f5659777cef7" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_65937e29-abc0-416c-b9df-a7c02273dbc3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba3fa804-ce12-412b-a0d3-17609c9f2192" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_65937e29-abc0-416c-b9df-a7c02273dbc3" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNet_5adffc5f-4a3e-4a91-a1c6-406ca9cafc1c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccountsReceivableNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba3fa804-ce12-412b-a0d3-17609c9f2192" xlink:to="loc_us-gaap_AccountsReceivableNet_5adffc5f-4a3e-4a91-a1c6-406ca9cafc1c" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetNet_d9f7d5b2-f326-4ab6-82bb-334b1714b481" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ContractWithCustomerAssetNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ba3fa804-ce12-412b-a0d3-17609c9f2192" xlink:to="loc_us-gaap_ContractWithCustomerAssetNet_d9f7d5b2-f326-4ab6-82bb-334b1714b481" xlink:type="arc" order="20"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/AcquisitionsandDivestituresSummaryofIntangibleAsstsAcquiredDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#AcquisitionsandDivestituresSummaryofIntangibleAsstsAcquiredDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/AcquisitionsandDivestituresSummaryofIntangibleAsstsAcquiredDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_8cbcb979-d7c0-48c4-a169-cec2d9c85e74" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_9e306111-f006-4c56-b11f-cc367942a9f9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8cbcb979-d7c0-48c4-a169-cec2d9c85e74" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_9e306111-f006-4c56-b11f-cc367942a9f9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_df7fe7b9-5ac4-46b3-93ac-aca01b97ce5e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_9e306111-f006-4c56-b11f-cc367942a9f9" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_df7fe7b9-5ac4-46b3-93ac-aca01b97ce5e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_df7fe7b9-5ac4-46b3-93ac-aca01b97ce5e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_df7fe7b9-5ac4-46b3-93ac-aca01b97ce5e" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_df7fe7b9-5ac4-46b3-93ac-aca01b97ce5e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ed2471f7-476e-4c7e-90b1-e584e907e96e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_df7fe7b9-5ac4-46b3-93ac-aca01b97ce5e" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ed2471f7-476e-4c7e-90b1-e584e907e96e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_EvoquaAcquisitionMember_ea1bf526-1674-4304-bd32-6191853b2ea8" xlink:href="xyl-20240930.xsd#xyl_EvoquaAcquisitionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ed2471f7-476e-4c7e-90b1-e584e907e96e" xlink:to="loc_xyl_EvoquaAcquisitionMember_ea1bf526-1674-4304-bd32-6191853b2ea8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_ab934856-b156-4e1d-80ce-b8ae8e664950" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_9e306111-f006-4c56-b11f-cc367942a9f9" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_ab934856-b156-4e1d-80ce-b8ae8e664950" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_ab934856-b156-4e1d-80ce-b8ae8e664950_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_ab934856-b156-4e1d-80ce-b8ae8e664950" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_ab934856-b156-4e1d-80ce-b8ae8e664950_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7061aa2d-3fc4-4f8c-8293-279d4af455a9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_ab934856-b156-4e1d-80ce-b8ae8e664950" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7061aa2d-3fc4-4f8c-8293-279d4af455a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksMember_ea613543-f49d-49c4-aa31-e995fb41bc07" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TrademarksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7061aa2d-3fc4-4f8c-8293-279d4af455a9" xlink:to="loc_us-gaap_TrademarksMember_ea613543-f49d-49c4-aa31-e995fb41bc07" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TechnologyBasedIntangibleAssetsMember_9848f13e-9c1a-4136-94eb-a285c344fe97" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TechnologyBasedIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7061aa2d-3fc4-4f8c-8293-279d4af455a9" xlink:to="loc_us-gaap_TechnologyBasedIntangibleAssetsMember_9848f13e-9c1a-4136-94eb-a285c344fe97" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_acc759e7-6a7a-4f0d-a5bd-3b1026c53235" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7061aa2d-3fc4-4f8c-8293-279d4af455a9" xlink:to="loc_us-gaap_CustomerRelationshipsMember_acc759e7-6a7a-4f0d-a5bd-3b1026c53235" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OrderOrProductionBacklogMember_8c160289-9a39-48ad-a664-05f2f451e209" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OrderOrProductionBacklogMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7061aa2d-3fc4-4f8c-8293-279d4af455a9" xlink:to="loc_us-gaap_OrderOrProductionBacklogMember_8c160289-9a39-48ad-a664-05f2f451e209" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_PermitsMember_892231e8-5aed-4656-b52d-7e1f7fc08b04" xlink:href="xyl-20240930.xsd#xyl_PermitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7061aa2d-3fc4-4f8c-8293-279d4af455a9" xlink:to="loc_xyl_PermitsMember_892231e8-5aed-4656-b52d-7e1f7fc08b04" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareDevelopmentMember_f0e9e5b7-46a9-444b-b3c3-22d6c25a2f2e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SoftwareDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7061aa2d-3fc4-4f8c-8293-279d4af455a9" xlink:to="loc_us-gaap_SoftwareDevelopmentMember_f0e9e5b7-46a9-444b-b3c3-22d6c25a2f2e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_d92cad99-b255-44e3-8542-fe43298bcc23" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_9e306111-f006-4c56-b11f-cc367942a9f9" xlink:to="loc_srt_RangeAxis_d92cad99-b255-44e3-8542-fe43298bcc23" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d92cad99-b255-44e3-8542-fe43298bcc23_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_d92cad99-b255-44e3-8542-fe43298bcc23" xlink:to="loc_srt_RangeMember_d92cad99-b255-44e3-8542-fe43298bcc23_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_c8805af5-62b0-444b-b479-05b40dfa9a68" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_d92cad99-b255-44e3-8542-fe43298bcc23" xlink:to="loc_srt_RangeMember_c8805af5-62b0-444b-b479-05b40dfa9a68" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_f5504bb4-d18e-4a5d-aea2-08f56ebc7425" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_c8805af5-62b0-444b-b479-05b40dfa9a68" xlink:to="loc_srt_MinimumMember_f5504bb4-d18e-4a5d-aea2-08f56ebc7425" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_3fc93fdd-e6b3-4a8d-99e3-493b7b40c679" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_c8805af5-62b0-444b-b479-05b40dfa9a68" xlink:to="loc_srt_MaximumMember_3fc93fdd-e6b3-4a8d-99e3-493b7b40c679" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_AcquiredFiniteLivedIntangibleAssetsUsefulLife_75eb758e-acf4-43ca-9d21-a57183365a16" xlink:href="xyl-20240930.xsd#xyl_AcquiredFiniteLivedIntangibleAssetsUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8cbcb979-d7c0-48c4-a169-cec2d9c85e74" xlink:to="loc_xyl_AcquiredFiniteLivedIntangibleAssetsUsefulLife_75eb758e-acf4-43ca-9d21-a57183365a16" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_928dfd7e-6bfb-41b2-97f4-be38abdf929f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8cbcb979-d7c0-48c4-a169-cec2d9c85e74" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_928dfd7e-6bfb-41b2-97f4-be38abdf929f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_59ff9bba-a7c4-4fc3-9405-3df17f8a22e4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8cbcb979-d7c0-48c4-a169-cec2d9c85e74" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_59ff9bba-a7c4-4fc3-9405-3df17f8a22e4" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/AcquisitionsandDivestituresSummaryofProFormaInformationDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#AcquisitionsandDivestituresSummaryofProFormaInformationDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/AcquisitionsandDivestituresSummaryofProFormaInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_9bfc16d6-8be1-4dd0-9586-af255a4dd34f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_cf9de145-e8ee-4255-9d5b-a9b4ea36724c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9bfc16d6-8be1-4dd0-9586-af255a4dd34f" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_cf9de145-e8ee-4255-9d5b-a9b4ea36724c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_3d337edd-870f-4b7c-85c7-d79240b6e85e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_cf9de145-e8ee-4255-9d5b-a9b4ea36724c" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_3d337edd-870f-4b7c-85c7-d79240b6e85e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3d337edd-870f-4b7c-85c7-d79240b6e85e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_3d337edd-870f-4b7c-85c7-d79240b6e85e" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3d337edd-870f-4b7c-85c7-d79240b6e85e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3ede7197-f65d-418d-9678-4134df301546" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_3d337edd-870f-4b7c-85c7-d79240b6e85e" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3ede7197-f65d-418d-9678-4134df301546" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_EvoquaAcquisitionMember_5cf683a3-b554-49a8-bb2b-a5128dc7916e" xlink:href="xyl-20240930.xsd#xyl_EvoquaAcquisitionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3ede7197-f65d-418d-9678-4134df301546" xlink:to="loc_xyl_EvoquaAcquisitionMember_5cf683a3-b554-49a8-bb2b-a5128dc7916e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_e3328096-99ef-44c6-a8fc-3996b953a183" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9bfc16d6-8be1-4dd0-9586-af255a4dd34f" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_e3328096-99ef-44c6-a8fc-3996b953a183" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_235614b3-3e72-445d-a37e-30a011c1d9a3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9bfc16d6-8be1-4dd0-9586-af255a4dd34f" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_235614b3-3e72-445d-a37e-30a011c1d9a3" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/AcquisitionsandDivestituresDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#AcquisitionsandDivestituresDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/AcquisitionsandDivestituresDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_b2aec88e-9863-4016-9635-7ad26c9dde27" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_19f70c22-1e26-45ba-97c2-5bcf4b94a64f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_b2aec88e-9863-4016-9635-7ad26c9dde27" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_19f70c22-1e26-45ba-97c2-5bcf4b94a64f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_c26f2b32-515a-4235-9d13-bf28eb5f21d6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_19f70c22-1e26-45ba-97c2-5bcf4b94a64f" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_c26f2b32-515a-4235-9d13-bf28eb5f21d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_c26f2b32-515a-4235-9d13-bf28eb5f21d6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_c26f2b32-515a-4235-9d13-bf28eb5f21d6" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_c26f2b32-515a-4235-9d13-bf28eb5f21d6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1664fe29-dbec-4120-ab3f-064355bc9835" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_c26f2b32-515a-4235-9d13-bf28eb5f21d6" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1664fe29-dbec-4120-ab3f-064355bc9835" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_EvoquaAcquisitionMember_d02570ea-9944-45f0-b637-a9351e42f708" xlink:href="xyl-20240930.xsd#xyl_EvoquaAcquisitionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1664fe29-dbec-4120-ab3f-064355bc9835" xlink:to="loc_xyl_EvoquaAcquisitionMember_d02570ea-9944-45f0-b637-a9351e42f708" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_d77c04ec-087f-45ee-bd4a-078440e9fe46" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_b2aec88e-9863-4016-9635-7ad26c9dde27" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_d77c04ec-087f-45ee-bd4a-078440e9fe46" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_BusinessCombinationConsiderationTransferredEquityInterestIssuedAndIssuableReplacementEquityAwards_9b20b5ef-25e3-4464-a006-056906f4dfba" xlink:href="xyl-20240930.xsd#xyl_BusinessCombinationConsiderationTransferredEquityInterestIssuedAndIssuableReplacementEquityAwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_b2aec88e-9863-4016-9635-7ad26c9dde27" xlink:to="loc_xyl_BusinessCombinationConsiderationTransferredEquityInterestIssuedAndIssuableReplacementEquityAwards_9b20b5ef-25e3-4464-a006-056906f4dfba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_BusinessCombinationConsiderationTransferredLiabilitiesPaid_986a231e-992f-4766-bad7-7e4883adbeb6" xlink:href="xyl-20240930.xsd#xyl_BusinessCombinationConsiderationTransferredLiabilitiesPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_b2aec88e-9863-4016-9635-7ad26c9dde27" xlink:to="loc_xyl_BusinessCombinationConsiderationTransferredLiabilitiesPaid_986a231e-992f-4766-bad7-7e4883adbeb6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_311b813a-4b45-4493-acf6-78a75b1234fe" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_b2aec88e-9863-4016-9635-7ad26c9dde27" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_311b813a-4b45-4493-acf6-78a75b1234fe" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_d429f072-bf8b-487f-a9eb-c1a89d2ccd75" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_b2aec88e-9863-4016-9635-7ad26c9dde27" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_d429f072-bf8b-487f-a9eb-c1a89d2ccd75" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/RevenueDisaggregationofRevenueDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#RevenueDisaggregationofRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/RevenueDisaggregationofRevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_990de0f0-5c2f-43b4-ab8e-404ee6fb1c34" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_468b7b57-5b13-4581-aa85-ee913883667a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_990de0f0-5c2f-43b4-ab8e-404ee6fb1c34" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_468b7b57-5b13-4581-aa85-ee913883667a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_5a1d3994-16c3-4b4b-97bf-208a09a3f2d1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_468b7b57-5b13-4581-aa85-ee913883667a" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_5a1d3994-16c3-4b4b-97bf-208a09a3f2d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_5a1d3994-16c3-4b4b-97bf-208a09a3f2d1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_5a1d3994-16c3-4b4b-97bf-208a09a3f2d1" xlink:to="loc_us-gaap_SegmentDomain_5a1d3994-16c3-4b4b-97bf-208a09a3f2d1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_c0700000-ce14-4b50-968d-5893239b8553" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_5a1d3994-16c3-4b4b-97bf-208a09a3f2d1" xlink:to="loc_us-gaap_SegmentDomain_c0700000-ce14-4b50-968d-5893239b8553" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_WaterInfrastructureMember_d6075656-4a11-482e-9f55-e66ba0b5f41f" xlink:href="xyl-20240930.xsd#xyl_WaterInfrastructureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_c0700000-ce14-4b50-968d-5893239b8553" xlink:to="loc_xyl_WaterInfrastructureMember_d6075656-4a11-482e-9f55-e66ba0b5f41f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_AppliedWaterMember_d0b47e4b-a8b3-4ea3-872a-5157cd728049" xlink:href="xyl-20240930.xsd#xyl_AppliedWaterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_c0700000-ce14-4b50-968d-5893239b8553" xlink:to="loc_xyl_AppliedWaterMember_d0b47e4b-a8b3-4ea3-872a-5157cd728049" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_MeasurementandControlSolutionsMember_34feae96-f9c8-4b66-baec-ea40bafcf05d" xlink:href="xyl-20240930.xsd#xyl_MeasurementandControlSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_c0700000-ce14-4b50-968d-5893239b8553" xlink:to="loc_xyl_MeasurementandControlSolutionsMember_34feae96-f9c8-4b66-baec-ea40bafcf05d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_WaterSolutionsAndServicesSegmentMember_e8a89546-c17f-49bd-9274-3c58140af449" xlink:href="xyl-20240930.xsd#xyl_WaterSolutionsAndServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_c0700000-ce14-4b50-968d-5893239b8553" xlink:to="loc_xyl_WaterSolutionsAndServicesSegmentMember_e8a89546-c17f-49bd-9274-3c58140af449" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_1d53924a-43de-48a4-8f20-84df67c3b0cf" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_468b7b57-5b13-4581-aa85-ee913883667a" xlink:to="loc_srt_ProductOrServiceAxis_1d53924a-43de-48a4-8f20-84df67c3b0cf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_1d53924a-43de-48a4-8f20-84df67c3b0cf_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_1d53924a-43de-48a4-8f20-84df67c3b0cf" xlink:to="loc_srt_ProductsAndServicesDomain_1d53924a-43de-48a4-8f20-84df67c3b0cf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_866a0669-96e7-42c2-b4a3-73784e58e507" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_1d53924a-43de-48a4-8f20-84df67c3b0cf" xlink:to="loc_srt_ProductsAndServicesDomain_866a0669-96e7-42c2-b4a3-73784e58e507" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_TransportMember_d87d35d9-edc4-4daa-a85b-1013fac087f2" xlink:href="xyl-20240930.xsd#xyl_TransportMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_866a0669-96e7-42c2-b4a3-73784e58e507" xlink:to="loc_xyl_TransportMember_d87d35d9-edc4-4daa-a85b-1013fac087f2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_TreatmentMember_883564a9-3b6a-455a-98e3-d620e1bb2810" xlink:href="xyl-20240930.xsd#xyl_TreatmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_866a0669-96e7-42c2-b4a3-73784e58e507" xlink:to="loc_xyl_TreatmentMember_883564a9-3b6a-455a-98e3-d620e1bb2810" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_CommercialBuildingServicesMember_e5601d6e-2569-47c2-81e1-348848972b56" xlink:href="xyl-20240930.xsd#xyl_CommercialBuildingServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_866a0669-96e7-42c2-b4a3-73784e58e507" xlink:to="loc_xyl_CommercialBuildingServicesMember_e5601d6e-2569-47c2-81e1-348848972b56" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_IndustrialWaterMember_84aff155-14a4-4f67-98c0-bcd22b357c03" xlink:href="xyl-20240930.xsd#xyl_IndustrialWaterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_866a0669-96e7-42c2-b4a3-73784e58e507" xlink:to="loc_xyl_IndustrialWaterMember_84aff155-14a4-4f67-98c0-bcd22b357c03" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilitiesInventoryWaterMember_6a6faae3-7b90-4b71-826c-c1c55ba1b84c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PublicUtilitiesInventoryWaterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_866a0669-96e7-42c2-b4a3-73784e58e507" xlink:to="loc_us-gaap_PublicUtilitiesInventoryWaterMember_6a6faae3-7b90-4b71-826c-c1c55ba1b84c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_ElectricMember_e2ddbb09-50e9-476f-ae5a-e816ad4e9078" xlink:href="xyl-20240930.xsd#xyl_ElectricMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_866a0669-96e7-42c2-b4a3-73784e58e507" xlink:to="loc_xyl_ElectricMember_e2ddbb09-50e9-476f-ae5a-e816ad4e9078" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_89403e41-d1e0-4d6a-a06b-5e8a551977e3" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_468b7b57-5b13-4581-aa85-ee913883667a" xlink:to="loc_srt_StatementGeographicalAxis_89403e41-d1e0-4d6a-a06b-5e8a551977e3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_89403e41-d1e0-4d6a-a06b-5e8a551977e3_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_89403e41-d1e0-4d6a-a06b-5e8a551977e3" xlink:to="loc_srt_SegmentGeographicalDomain_89403e41-d1e0-4d6a-a06b-5e8a551977e3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_d3cd4807-5ef0-44a0-9d79-1004710b2033" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_89403e41-d1e0-4d6a-a06b-5e8a551977e3" xlink:to="loc_srt_SegmentGeographicalDomain_d3cd4807-5ef0-44a0-9d79-1004710b2033" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_9b38c6f7-8ca5-45ca-a26e-1bf6b7280171" xlink:href="https://xbrl.sec.gov/country/2024/country-2024.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_d3cd4807-5ef0-44a0-9d79-1004710b2033" xlink:to="loc_country_US_9b38c6f7-8ca5-45ca-a26e-1bf6b7280171" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_WesternEuropeMember_4ca59dfd-14c8-41ee-8261-e26a2563ea4f" xlink:href="xyl-20240930.xsd#xyl_WesternEuropeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_d3cd4807-5ef0-44a0-9d79-1004710b2033" xlink:to="loc_xyl_WesternEuropeMember_4ca59dfd-14c8-41ee-8261-e26a2563ea4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_EmergingMarketsMember_6a13578f-efa5-4e06-9d52-6440f9012a32" xlink:href="xyl-20240930.xsd#xyl_EmergingMarketsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_d3cd4807-5ef0-44a0-9d79-1004710b2033" xlink:to="loc_xyl_EmergingMarketsMember_6a13578f-efa5-4e06-9d52-6440f9012a32" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_OtherGeographicalRegionsMember_087328e4-81bf-4023-8228-0079e1ef8f9a" xlink:href="xyl-20240930.xsd#xyl_OtherGeographicalRegionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_d3cd4807-5ef0-44a0-9d79-1004710b2033" xlink:to="loc_xyl_OtherGeographicalRegionsMember_087328e4-81bf-4023-8228-0079e1ef8f9a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_d987b93c-848a-4601-a8fd-421d8fc1ea03" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_990de0f0-5c2f-43b4-ab8e-404ee6fb1c34" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_d987b93c-848a-4601-a8fd-421d8fc1ea03" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_OtherRevenues_8c304fad-4ed5-400e-af47-fe870f91eb22" xlink:href="xyl-20240930.xsd#xyl_OtherRevenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_990de0f0-5c2f-43b4-ab8e-404ee6fb1c34" xlink:to="loc_xyl_OtherRevenues_8c304fad-4ed5-400e-af47-fe870f91eb22" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_01ecb7d0-7884-4b78-9f23-272be70ba71b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_990de0f0-5c2f-43b4-ab8e-404ee6fb1c34" xlink:to="loc_us-gaap_Revenues_01ecb7d0-7884-4b78-9f23-272be70ba71b" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/RevenueNarrativeDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#RevenueNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/RevenueNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_a6b64949-9727-446a-8d52-02660a2384df" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_ff280d63-e13a-4e9a-bf3b-d64129aabf64" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_a6b64949-9727-446a-8d52-02660a2384df" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_ff280d63-e13a-4e9a-bf3b-d64129aabf64" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_1ad09b98-30cd-4edf-8d3e-1f25c636dbd0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_ff280d63-e13a-4e9a-bf3b-d64129aabf64" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_1ad09b98-30cd-4edf-8d3e-1f25c636dbd0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_24ffccf9-4b1f-4ed4-b290-1c4aefdf8940" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_ff280d63-e13a-4e9a-bf3b-d64129aabf64" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_24ffccf9-4b1f-4ed4-b290-1c4aefdf8940" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_24ffccf9-4b1f-4ed4-b290-1c4aefdf8940_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_24ffccf9-4b1f-4ed4-b290-1c4aefdf8940" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_24ffccf9-4b1f-4ed4-b290-1c4aefdf8940_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_c7830593-db33-42c8-bc62-3d00d8933813" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_24ffccf9-4b1f-4ed4-b290-1c4aefdf8940" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_c7830593-db33-42c8-bc62-3d00d8933813" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_EvoquaAcquisitionMember_6ac871b7-f201-4de8-93d3-ccddd115c4a4" xlink:href="xyl-20240930.xsd#xyl_EvoquaAcquisitionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_c7830593-db33-42c8-bc62-3d00d8933813" xlink:to="loc_xyl_EvoquaAcquisitionMember_6ac871b7-f201-4de8-93d3-ccddd115c4a4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_ce454cce-b029-4c5a-8680-3bee0fd13eb3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_a6b64949-9727-446a-8d52-02660a2384df" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_ce454cce-b029-4c5a-8680-3bee0fd13eb3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_6637c8ed-3eca-45c7-b2d0-ceb5f9f715fe" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_a6b64949-9727-446a-8d52-02660a2384df" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_6637c8ed-3eca-45c7-b2d0-ceb5f9f715fe" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/RevenueNarrativeDetails_1" xlink:type="simple" xlink:href="xyl-20240930.xsd#RevenueNarrativeDetails_1"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/RevenueNarrativeDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_a6b64949-9727-446a-8d52-02660a2384df" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_ff280d63-e13a-4e9a-bf3b-d64129aabf64" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_a6b64949-9727-446a-8d52-02660a2384df" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_ff280d63-e13a-4e9a-bf3b-d64129aabf64" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_24ffccf9-4b1f-4ed4-b290-1c4aefdf8940" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_ff280d63-e13a-4e9a-bf3b-d64129aabf64" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_24ffccf9-4b1f-4ed4-b290-1c4aefdf8940" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_24ffccf9-4b1f-4ed4-b290-1c4aefdf8940_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_24ffccf9-4b1f-4ed4-b290-1c4aefdf8940" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_24ffccf9-4b1f-4ed4-b290-1c4aefdf8940_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_c7830593-db33-42c8-bc62-3d00d8933813" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_24ffccf9-4b1f-4ed4-b290-1c4aefdf8940" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_c7830593-db33-42c8-bc62-3d00d8933813" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_EvoquaAcquisitionMember_6ac871b7-f201-4de8-93d3-ccddd115c4a4" xlink:href="xyl-20240930.xsd#xyl_EvoquaAcquisitionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_c7830593-db33-42c8-bc62-3d00d8933813" xlink:to="loc_xyl_EvoquaAcquisitionMember_6ac871b7-f201-4de8-93d3-ccddd115c4a4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_ce454cce-b029-4c5a-8680-3bee0fd13eb3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_a6b64949-9727-446a-8d52-02660a2384df" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_ce454cce-b029-4c5a-8680-3bee0fd13eb3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_6637c8ed-3eca-45c7-b2d0-ceb5f9f715fe" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_a6b64949-9727-446a-8d52-02660a2384df" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_6637c8ed-3eca-45c7-b2d0-ceb5f9f715fe" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/RestructuringChargesTextualsDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#RestructuringChargesTextualsDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/RestructuringChargesTextualsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_c398312a-4e7f-425e-961a-0100b9bcb132" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_ed21b7fa-0d55-4db0-aed5-adf2ca90f37f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_c398312a-4e7f-425e-961a-0100b9bcb132" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_ed21b7fa-0d55-4db0-aed5-adf2ca90f37f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_76fc2345-69f9-4501-9de3-4480c1cd0db8" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_ed21b7fa-0d55-4db0-aed5-adf2ca90f37f" xlink:to="loc_srt_RangeAxis_76fc2345-69f9-4501-9de3-4480c1cd0db8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_76fc2345-69f9-4501-9de3-4480c1cd0db8_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_76fc2345-69f9-4501-9de3-4480c1cd0db8" xlink:to="loc_srt_RangeMember_76fc2345-69f9-4501-9de3-4480c1cd0db8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_1868629b-61c0-4a51-95e3-c5ba6f3e6e32" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_76fc2345-69f9-4501-9de3-4480c1cd0db8" xlink:to="loc_srt_RangeMember_1868629b-61c0-4a51-95e3-c5ba6f3e6e32" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_e1283cf4-ca67-42b9-9f54-cc9218089055" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_1868629b-61c0-4a51-95e3-c5ba6f3e6e32" xlink:to="loc_srt_MaximumMember_e1283cf4-ca67-42b9-9f54-cc9218089055" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_7ae6cd0e-ec5e-4c28-8071-3058c10d6144" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_ed21b7fa-0d55-4db0-aed5-adf2ca90f37f" xlink:to="loc_us-gaap_RestructuringPlanAxis_7ae6cd0e-ec5e-4c28-8071-3058c10d6144" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_7ae6cd0e-ec5e-4c28-8071-3058c10d6144_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_7ae6cd0e-ec5e-4c28-8071-3058c10d6144" xlink:to="loc_us-gaap_RestructuringPlanDomain_7ae6cd0e-ec5e-4c28-8071-3058c10d6144_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_66b6871b-51b2-4a94-9db5-e700246d6471" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_7ae6cd0e-ec5e-4c28-8071-3058c10d6144" xlink:to="loc_us-gaap_RestructuringPlanDomain_66b6871b-51b2-4a94-9db5-e700246d6471" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_TwoThousandTwentyThreeRestructuringPlanMember_5daacf2b-8120-491d-a050-5060aff87a52" xlink:href="xyl-20240930.xsd#xyl_TwoThousandTwentyThreeRestructuringPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_66b6871b-51b2-4a94-9db5-e700246d6471" xlink:to="loc_xyl_TwoThousandTwentyThreeRestructuringPlanMember_5daacf2b-8120-491d-a050-5060aff87a52" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_TwoThousandTwentyFourRestructuringPlanMember_99a493a7-0e07-485c-97dc-d674cdff2dc3" xlink:href="xyl-20240930.xsd#xyl_TwoThousandTwentyFourRestructuringPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_66b6871b-51b2-4a94-9db5-e700246d6471" xlink:to="loc_xyl_TwoThousandTwentyFourRestructuringPlanMember_99a493a7-0e07-485c-97dc-d674cdff2dc3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_7b6b8a54-9f17-4c2f-8680-5f4d124b654a" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_ed21b7fa-0d55-4db0-aed5-adf2ca90f37f" xlink:to="loc_srt_ConsolidationItemsAxis_7b6b8a54-9f17-4c2f-8680-5f4d124b654a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_7b6b8a54-9f17-4c2f-8680-5f4d124b654a_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_7b6b8a54-9f17-4c2f-8680-5f4d124b654a" xlink:to="loc_srt_ConsolidationItemsDomain_7b6b8a54-9f17-4c2f-8680-5f4d124b654a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_601281c6-a306-40c6-9156-6fcb984ae553" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_7b6b8a54-9f17-4c2f-8680-5f4d124b654a" xlink:to="loc_srt_ConsolidationItemsDomain_601281c6-a306-40c6-9156-6fcb984ae553" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_eb9ed8d0-b05b-4dd0-a1bf-8b35e1865007" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_601281c6-a306-40c6-9156-6fcb984ae553" xlink:to="loc_us-gaap_CorporateNonSegmentMember_eb9ed8d0-b05b-4dd0-a1bf-8b35e1865007" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_d9602a81-c25a-4821-a2c4-fc68a9871b4d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_ed21b7fa-0d55-4db0-aed5-adf2ca90f37f" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_d9602a81-c25a-4821-a2c4-fc68a9871b4d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_d9602a81-c25a-4821-a2c4-fc68a9871b4d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_d9602a81-c25a-4821-a2c4-fc68a9871b4d" xlink:to="loc_us-gaap_SegmentDomain_d9602a81-c25a-4821-a2c4-fc68a9871b4d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_cba0cd92-5eb5-4341-ab2a-7ab4046ee6fe" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_d9602a81-c25a-4821-a2c4-fc68a9871b4d" xlink:to="loc_us-gaap_SegmentDomain_cba0cd92-5eb5-4341-ab2a-7ab4046ee6fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_WaterSolutionsAndServicesSegmentMember_e0ad2993-771e-4ed2-8dd1-de27356efd3b" xlink:href="xyl-20240930.xsd#xyl_WaterSolutionsAndServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_cba0cd92-5eb5-4341-ab2a-7ab4046ee6fe" xlink:to="loc_xyl_WaterSolutionsAndServicesSegmentMember_e0ad2993-771e-4ed2-8dd1-de27356efd3b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_MeasurementandControlSolutionsMember_c9d4c29f-7dca-4938-9313-c8f103bb6670" xlink:href="xyl-20240930.xsd#xyl_MeasurementandControlSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_cba0cd92-5eb5-4341-ab2a-7ab4046ee6fe" xlink:to="loc_xyl_MeasurementandControlSolutionsMember_c9d4c29f-7dca-4938-9313-c8f103bb6670" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_0c4dab13-6d8e-48e6-b4d6-9eb7b92f827a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_ed21b7fa-0d55-4db0-aed5-adf2ca90f37f" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_0c4dab13-6d8e-48e6-b4d6-9eb7b92f827a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0c4dab13-6d8e-48e6-b4d6-9eb7b92f827a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_0c4dab13-6d8e-48e6-b4d6-9eb7b92f827a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0c4dab13-6d8e-48e6-b4d6-9eb7b92f827a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_5c7489df-ac44-4cb5-a354-044dfaf04c72" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_0c4dab13-6d8e-48e6-b4d6-9eb7b92f827a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_5c7489df-ac44-4cb5-a354-044dfaf04c72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_CustomerRelationshipsAndTrademarksMember_6f928150-a8e6-4d04-b523-5e2540dd1b18" xlink:href="xyl-20240930.xsd#xyl_CustomerRelationshipsAndTrademarksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_5c7489df-ac44-4cb5-a354-044dfaf04c72" xlink:to="loc_xyl_CustomerRelationshipsAndTrademarksMember_6f928150-a8e6-4d04-b523-5e2540dd1b18" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostIncurredCost_0763de3a-ec10-4c3b-bf8c-be331b55f9be" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringAndRelatedCostIncurredCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_c398312a-4e7f-425e-961a-0100b9bcb132" xlink:to="loc_us-gaap_RestructuringAndRelatedCostIncurredCost_0763de3a-ec10-4c3b-bf8c-be331b55f9be" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_2ce9ef5a-1d8b-4da4-b61a-d0048075b3ff" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_c398312a-4e7f-425e-961a-0100b9bcb132" xlink:to="loc_us-gaap_RestructuringCharges_2ce9ef5a-1d8b-4da4-b61a-d0048075b3ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill_4010e5c5-f99d-4fab-a427-4ef65d70bcd7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_c398312a-4e7f-425e-961a-0100b9bcb132" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill_4010e5c5-f99d-4fab-a427-4ef65d70bcd7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetImpairmentCharges_5b8ab8f4-7e35-46d2-861c-110a1edf56e7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_c398312a-4e7f-425e-961a-0100b9bcb132" xlink:to="loc_us-gaap_AssetImpairmentCharges_5b8ab8f4-7e35-46d2-861c-110a1edf56e7" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/RestructuringChargesRestructuringChargesDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#RestructuringChargesRestructuringChargesDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/RestructuringChargesRestructuringChargesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_f4346a1a-129a-42cd-8e52-c4a4feb336a5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_896a5a07-a6f5-4f2b-91bd-5dce6563cfac" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_f4346a1a-129a-42cd-8e52-c4a4feb336a5" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_896a5a07-a6f5-4f2b-91bd-5dce6563cfac" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_2c3279f7-3807-430a-b850-6ad916c3b1fb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_896a5a07-a6f5-4f2b-91bd-5dce6563cfac" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_2c3279f7-3807-430a-b850-6ad916c3b1fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_2c3279f7-3807-430a-b850-6ad916c3b1fb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_2c3279f7-3807-430a-b850-6ad916c3b1fb" xlink:to="loc_us-gaap_SegmentDomain_2c3279f7-3807-430a-b850-6ad916c3b1fb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_a9ffc24a-8f93-4090-8b24-65bbe5112ebc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_2c3279f7-3807-430a-b850-6ad916c3b1fb" xlink:to="loc_us-gaap_SegmentDomain_a9ffc24a-8f93-4090-8b24-65bbe5112ebc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_WaterInfrastructureMember_ef781d47-1981-405c-be18-6f9a6998a0f5" xlink:href="xyl-20240930.xsd#xyl_WaterInfrastructureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_a9ffc24a-8f93-4090-8b24-65bbe5112ebc" xlink:to="loc_xyl_WaterInfrastructureMember_ef781d47-1981-405c-be18-6f9a6998a0f5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_AppliedWaterMember_53908840-3870-449e-9c20-e1427d62a06c" xlink:href="xyl-20240930.xsd#xyl_AppliedWaterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_a9ffc24a-8f93-4090-8b24-65bbe5112ebc" xlink:to="loc_xyl_AppliedWaterMember_53908840-3870-449e-9c20-e1427d62a06c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_MeasurementandControlSolutionsMember_26cf3816-18be-4887-9735-d169f66765d4" xlink:href="xyl-20240930.xsd#xyl_MeasurementandControlSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_a9ffc24a-8f93-4090-8b24-65bbe5112ebc" xlink:to="loc_xyl_MeasurementandControlSolutionsMember_26cf3816-18be-4887-9735-d169f66765d4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_WaterSolutionsAndServicesSegmentMember_8573804c-7e68-4f35-b15d-7631aa7253e8" xlink:href="xyl-20240930.xsd#xyl_WaterSolutionsAndServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_a9ffc24a-8f93-4090-8b24-65bbe5112ebc" xlink:to="loc_xyl_WaterSolutionsAndServicesSegmentMember_8573804c-7e68-4f35-b15d-7631aa7253e8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_06cfc6f9-45a0-48e1-8c21-93c45276e91f" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_896a5a07-a6f5-4f2b-91bd-5dce6563cfac" xlink:to="loc_srt_ConsolidationItemsAxis_06cfc6f9-45a0-48e1-8c21-93c45276e91f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_06cfc6f9-45a0-48e1-8c21-93c45276e91f_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_06cfc6f9-45a0-48e1-8c21-93c45276e91f" xlink:to="loc_srt_ConsolidationItemsDomain_06cfc6f9-45a0-48e1-8c21-93c45276e91f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_804a5f7d-66f2-4792-8e91-90869e214f50" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_06cfc6f9-45a0-48e1-8c21-93c45276e91f" xlink:to="loc_srt_ConsolidationItemsDomain_804a5f7d-66f2-4792-8e91-90869e214f50" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_2b9abb0a-f7c4-4302-9097-4cde7040eae7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_804a5f7d-66f2-4792-8e91-90869e214f50" xlink:to="loc_us-gaap_OperatingSegmentsMember_2b9abb0a-f7c4-4302-9097-4cde7040eae7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_5ac15d32-152d-4e9c-b073-d3edfe3272d6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_804a5f7d-66f2-4792-8e91-90869e214f50" xlink:to="loc_us-gaap_CorporateNonSegmentMember_5ac15d32-152d-4e9c-b073-d3edfe3272d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeveranceCosts1_e17573a8-3fab-46fb-b6b8-34616291b657" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SeveranceCosts1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_f4346a1a-129a-42cd-8e52-c4a4feb336a5" xlink:to="loc_us-gaap_SeveranceCosts1_e17573a8-3fab-46fb-b6b8-34616291b657" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_RestructuringReserveAssetImpairmentCosts_a096b581-dd3e-402a-92a0-d7b5bb181eef" xlink:href="xyl-20240930.xsd#xyl_RestructuringReserveAssetImpairmentCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_f4346a1a-129a-42cd-8e52-c4a4feb336a5" xlink:to="loc_xyl_RestructuringReserveAssetImpairmentCosts_a096b581-dd3e-402a-92a0-d7b5bb181eef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveAccrualAdjustment1_40906320-ed15-4ea7-a57d-447dc9d94fd8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringReserveAccrualAdjustment1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_f4346a1a-129a-42cd-8e52-c4a4feb336a5" xlink:to="loc_us-gaap_RestructuringReserveAccrualAdjustment1_40906320-ed15-4ea7-a57d-447dc9d94fd8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_59917a7d-f8e1-4089-9ad4-cfb54e8ffec4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_f4346a1a-129a-42cd-8e52-c4a4feb336a5" xlink:to="loc_us-gaap_RestructuringCharges_59917a7d-f8e1-4089-9ad4-cfb54e8ffec4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetImpairmentCharges_adc2e9a6-e886-4463-9a33-16bb7b0c551a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_f4346a1a-129a-42cd-8e52-c4a4feb336a5" xlink:to="loc_us-gaap_AssetImpairmentCharges_adc2e9a6-e886-4463-9a33-16bb7b0c551a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_AssetImpairmentandRestructuringCharges_7b6216e8-ff45-4681-8152-09b34a94ef61" xlink:href="xyl-20240930.xsd#xyl_AssetImpairmentandRestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_f4346a1a-129a-42cd-8e52-c4a4feb336a5" xlink:to="loc_xyl_AssetImpairmentandRestructuringCharges_7b6216e8-ff45-4681-8152-09b34a94ef61" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/RestructuringChargesAccrualRollfowardDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#RestructuringChargesAccrualRollfowardDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/RestructuringChargesAccrualRollfowardDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_692da759-d944-45f7-bad9-a4c35a8c7335" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_dacf5155-fc94-466a-b24f-a78df3d75b5a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_692da759-d944-45f7-bad9-a4c35a8c7335" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_dacf5155-fc94-466a-b24f-a78df3d75b5a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_369f8bcb-ce03-4b70-be19-fb5d79f7f3c7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_dacf5155-fc94-466a-b24f-a78df3d75b5a" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_369f8bcb-ce03-4b70-be19-fb5d79f7f3c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_369f8bcb-ce03-4b70-be19-fb5d79f7f3c7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_369f8bcb-ce03-4b70-be19-fb5d79f7f3c7" xlink:to="loc_us-gaap_SegmentDomain_369f8bcb-ce03-4b70-be19-fb5d79f7f3c7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_4f62ac1a-c989-46c2-b8c1-3795a758da6e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_369f8bcb-ce03-4b70-be19-fb5d79f7f3c7" xlink:to="loc_us-gaap_SegmentDomain_4f62ac1a-c989-46c2-b8c1-3795a758da6e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_WaterInfrastructureMember_c0a47116-8180-4542-a7d0-3b3a91db45d1" xlink:href="xyl-20240930.xsd#xyl_WaterInfrastructureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_4f62ac1a-c989-46c2-b8c1-3795a758da6e" xlink:to="loc_xyl_WaterInfrastructureMember_c0a47116-8180-4542-a7d0-3b3a91db45d1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_AppliedWaterMember_13214fcf-6b63-41f0-8c34-e86e6e717b88" xlink:href="xyl-20240930.xsd#xyl_AppliedWaterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_4f62ac1a-c989-46c2-b8c1-3795a758da6e" xlink:to="loc_xyl_AppliedWaterMember_13214fcf-6b63-41f0-8c34-e86e6e717b88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_MeasurementandControlSolutionsMember_37901520-d634-46f5-a430-615e3025a469" xlink:href="xyl-20240930.xsd#xyl_MeasurementandControlSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_4f62ac1a-c989-46c2-b8c1-3795a758da6e" xlink:to="loc_xyl_MeasurementandControlSolutionsMember_37901520-d634-46f5-a430-615e3025a469" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_WaterSolutionsAndServicesSegmentMember_875bc4a5-a53e-4b5b-9237-cbc12527a4cf" xlink:href="xyl-20240930.xsd#xyl_WaterSolutionsAndServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_4f62ac1a-c989-46c2-b8c1-3795a758da6e" xlink:to="loc_xyl_WaterSolutionsAndServicesSegmentMember_875bc4a5-a53e-4b5b-9237-cbc12527a4cf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_fb8d4064-5450-492c-9e1b-0f24dcb6e786" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_dacf5155-fc94-466a-b24f-a78df3d75b5a" xlink:to="loc_srt_ConsolidationItemsAxis_fb8d4064-5450-492c-9e1b-0f24dcb6e786" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_fb8d4064-5450-492c-9e1b-0f24dcb6e786_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_fb8d4064-5450-492c-9e1b-0f24dcb6e786" xlink:to="loc_srt_ConsolidationItemsDomain_fb8d4064-5450-492c-9e1b-0f24dcb6e786_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_c1b45ebb-6b07-4325-a33a-694d0b5a2268" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_fb8d4064-5450-492c-9e1b-0f24dcb6e786" xlink:to="loc_srt_ConsolidationItemsDomain_c1b45ebb-6b07-4325-a33a-694d0b5a2268" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_c50ca12d-c76f-4ed4-a154-ac2de10cc42b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_c1b45ebb-6b07-4325-a33a-694d0b5a2268" xlink:to="loc_us-gaap_OperatingSegmentsMember_c50ca12d-c76f-4ed4-a154-ac2de10cc42b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MaterialReconcilingItemsMember_76dccdd8-6c73-4fbf-b6c5-40abd5411ccf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_MaterialReconcilingItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_c1b45ebb-6b07-4325-a33a-694d0b5a2268" xlink:to="loc_us-gaap_MaterialReconcilingItemsMember_76dccdd8-6c73-4fbf-b6c5-40abd5411ccf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_1b085c99-9fc6-4061-bad7-38ecc7118087" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_c1b45ebb-6b07-4325-a33a-694d0b5a2268" xlink:to="loc_us-gaap_CorporateNonSegmentMember_1b085c99-9fc6-4061-bad7-38ecc7118087" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveRollForward_7c4b2384-0358-46a9-8c4f-bb90cbdf8fe8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringReserveRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_692da759-d944-45f7-bad9-a4c35a8c7335" xlink:to="loc_us-gaap_RestructuringReserveRollForward_7c4b2384-0358-46a9-8c4f-bb90cbdf8fe8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_3e5a6e49-fdd5-4f4f-9ad2-7572b09aafd8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_7c4b2384-0358-46a9-8c4f-bb90cbdf8fe8" xlink:to="loc_us-gaap_RestructuringReserve_3e5a6e49-fdd5-4f4f-9ad2-7572b09aafd8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_b67620f8-d440-406e-a680-43c2a8ba3c7f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_7c4b2384-0358-46a9-8c4f-bb90cbdf8fe8" xlink:to="loc_us-gaap_RestructuringCharges_b67620f8-d440-406e-a680-43c2a8ba3c7f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRestructuring_cb83ced7-8512-43d6-a4ba-472f2c68d191" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsForRestructuring"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_7c4b2384-0358-46a9-8c4f-bb90cbdf8fe8" xlink:to="loc_us-gaap_PaymentsForRestructuring_cb83ced7-8512-43d6-a4ba-472f2c68d191" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_RestructuringReserveAssetImpairment_c654b454-3982-4bc5-b074-194fc97d7dae" xlink:href="xyl-20240930.xsd#xyl_RestructuringReserveAssetImpairment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_7c4b2384-0358-46a9-8c4f-bb90cbdf8fe8" xlink:to="loc_xyl_RestructuringReserveAssetImpairment_c654b454-3982-4bc5-b074-194fc97d7dae" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_RestructuringReserveShareBasedCompensation_df15c0f9-57ac-494c-96a6-00c7fa4d8a74" xlink:href="xyl-20240930.xsd#xyl_RestructuringReserveShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_7c4b2384-0358-46a9-8c4f-bb90cbdf8fe8" xlink:to="loc_xyl_RestructuringReserveShareBasedCompensation_df15c0f9-57ac-494c-96a6-00c7fa4d8a74" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveTranslationAndOtherAdjustment_1a719b31-dc24-469d-ae76-f21f9545f4be" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringReserveTranslationAndOtherAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_7c4b2384-0358-46a9-8c4f-bb90cbdf8fe8" xlink:to="loc_us-gaap_RestructuringReserveTranslationAndOtherAdjustment_1a719b31-dc24-469d-ae76-f21f9545f4be" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_83fb4654-d72f-4088-a7d6-6abe60ac6a3b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringReserve"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/RestructuringChargesEstimatedRestructuringCostsDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#RestructuringChargesEstimatedRestructuringCostsDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/RestructuringChargesEstimatedRestructuringCostsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_b7ec6eaf-6398-40df-8b8c-082bb3ef7b61" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_00e7820d-0ef9-4a16-8e67-f4dbc6d78ce0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_b7ec6eaf-6398-40df-8b8c-082bb3ef7b61" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_00e7820d-0ef9-4a16-8e67-f4dbc6d78ce0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_93e44aa4-4c8f-402c-a987-2e9110faa12b" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_00e7820d-0ef9-4a16-8e67-f4dbc6d78ce0" xlink:to="loc_srt_ConsolidationItemsAxis_93e44aa4-4c8f-402c-a987-2e9110faa12b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_93e44aa4-4c8f-402c-a987-2e9110faa12b_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_93e44aa4-4c8f-402c-a987-2e9110faa12b" xlink:to="loc_srt_ConsolidationItemsDomain_93e44aa4-4c8f-402c-a987-2e9110faa12b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_a54b6545-9bc8-4750-9272-352bcb686ff5" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_93e44aa4-4c8f-402c-a987-2e9110faa12b" xlink:to="loc_srt_ConsolidationItemsDomain_a54b6545-9bc8-4750-9272-352bcb686ff5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_f12a11fd-0739-41d8-b26b-b7e83ccc1746" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_a54b6545-9bc8-4750-9272-352bcb686ff5" xlink:to="loc_us-gaap_OperatingSegmentsMember_f12a11fd-0739-41d8-b26b-b7e83ccc1746" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_6d27b84b-d63c-461b-85b3-ec8a7bda4044" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_a54b6545-9bc8-4750-9272-352bcb686ff5" xlink:to="loc_us-gaap_CorporateNonSegmentMember_6d27b84b-d63c-461b-85b3-ec8a7bda4044" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_12bba973-9c9a-4020-b9e3-67e998ba1162" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_00e7820d-0ef9-4a16-8e67-f4dbc6d78ce0" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_12bba973-9c9a-4020-b9e3-67e998ba1162" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_12bba973-9c9a-4020-b9e3-67e998ba1162_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_12bba973-9c9a-4020-b9e3-67e998ba1162" xlink:to="loc_us-gaap_SegmentDomain_12bba973-9c9a-4020-b9e3-67e998ba1162_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_604c7496-a18e-4574-b5b2-fe8394966b93" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_12bba973-9c9a-4020-b9e3-67e998ba1162" xlink:to="loc_us-gaap_SegmentDomain_604c7496-a18e-4574-b5b2-fe8394966b93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_WaterInfrastructureMember_3850e91f-3c65-48e9-a448-f6c994ac7ea8" xlink:href="xyl-20240930.xsd#xyl_WaterInfrastructureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_604c7496-a18e-4574-b5b2-fe8394966b93" xlink:to="loc_xyl_WaterInfrastructureMember_3850e91f-3c65-48e9-a448-f6c994ac7ea8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_AppliedWaterMember_473c1025-6e76-4ca3-894a-9b2db6aa9a07" xlink:href="xyl-20240930.xsd#xyl_AppliedWaterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_604c7496-a18e-4574-b5b2-fe8394966b93" xlink:to="loc_xyl_AppliedWaterMember_473c1025-6e76-4ca3-894a-9b2db6aa9a07" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_MeasurementandControlSolutionsMember_a0c365a1-8df1-4a71-961d-39bc5f8c4183" xlink:href="xyl-20240930.xsd#xyl_MeasurementandControlSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_604c7496-a18e-4574-b5b2-fe8394966b93" xlink:to="loc_xyl_MeasurementandControlSolutionsMember_a0c365a1-8df1-4a71-961d-39bc5f8c4183" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_WaterSolutionsAndServicesSegmentMember_d3c064f6-e0d9-4d3f-9cb3-131480c617c3" xlink:href="xyl-20240930.xsd#xyl_WaterSolutionsAndServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_604c7496-a18e-4574-b5b2-fe8394966b93" xlink:to="loc_xyl_WaterSolutionsAndServicesSegmentMember_d3c064f6-e0d9-4d3f-9cb3-131480c617c3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_0f26e6ad-89ed-45b1-9e16-3a15ce21d64d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_00e7820d-0ef9-4a16-8e67-f4dbc6d78ce0" xlink:to="loc_us-gaap_RestructuringPlanAxis_0f26e6ad-89ed-45b1-9e16-3a15ce21d64d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_0f26e6ad-89ed-45b1-9e16-3a15ce21d64d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_0f26e6ad-89ed-45b1-9e16-3a15ce21d64d" xlink:to="loc_us-gaap_RestructuringPlanDomain_0f26e6ad-89ed-45b1-9e16-3a15ce21d64d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_7cd33e1a-61dd-4497-8a82-cc8a529d8609" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_0f26e6ad-89ed-45b1-9e16-3a15ce21d64d" xlink:to="loc_us-gaap_RestructuringPlanDomain_7cd33e1a-61dd-4497-8a82-cc8a529d8609" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_TwoThousandTwentyFourRestructuringPlanMember_9f251be6-d983-4d4e-9fd1-e5066b4aa4f5" xlink:href="xyl-20240930.xsd#xyl_TwoThousandTwentyFourRestructuringPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_7cd33e1a-61dd-4497-8a82-cc8a529d8609" xlink:to="loc_xyl_TwoThousandTwentyFourRestructuringPlanMember_9f251be6-d983-4d4e-9fd1-e5066b4aa4f5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_TwoThousandTwentyThreeRestructuringPlanMember_552f8a30-4bb2-4e60-b93b-7e0aef7272a0" xlink:href="xyl-20240930.xsd#xyl_TwoThousandTwentyThreeRestructuringPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_7cd33e1a-61dd-4497-8a82-cc8a529d8609" xlink:to="loc_xyl_TwoThousandTwentyThreeRestructuringPlanMember_552f8a30-4bb2-4e60-b93b-7e0aef7272a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_TwoThousandTwentyOneRestructuringPlanMember_114a8049-d6e6-496f-ac74-86a5e4e2c1ae" xlink:href="xyl-20240930.xsd#xyl_TwoThousandTwentyOneRestructuringPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_7cd33e1a-61dd-4497-8a82-cc8a529d8609" xlink:to="loc_xyl_TwoThousandTwentyOneRestructuringPlanMember_114a8049-d6e6-496f-ac74-86a5e4e2c1ae" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_c8fbc741-3a8a-49a9-b244-8522b17f8224" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringAndRelatedCostExpectedCost1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_b7ec6eaf-6398-40df-8b8c-082bb3ef7b61" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_c8fbc741-3a8a-49a9-b244-8522b17f8224" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostIncurredCost_7cd79836-2242-4339-8f85-032185a18ae9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringAndRelatedCostIncurredCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_b7ec6eaf-6398-40df-8b8c-082bb3ef7b61" xlink:to="loc_us-gaap_RestructuringAndRelatedCostIncurredCost_7cd79836-2242-4339-8f85-032185a18ae9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1_3ba58717-8124-4c83-8eae-bd14a747ecc1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_b7ec6eaf-6398-40df-8b8c-082bb3ef7b61" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1_3ba58717-8124-4c83-8eae-bd14a747ecc1" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/EarningsPerShareCalculationsforEPSDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#EarningsPerShareCalculationsforEPSDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/EarningsPerShareCalculationsforEPSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_xyl_ScheduleOfEarningsPerShareBasicAndDilutedLineItems_c5c6f66e-8e4f-4c65-8891-8f6d7bb0eaa8" xlink:href="xyl-20240930.xsd#xyl_ScheduleOfEarningsPerShareBasicAndDilutedLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_ScheduleOfEarningsPerShareBasicAndDilutedTable_5c62143b-39da-4763-9d06-2b7de6e520b6" xlink:href="xyl-20240930.xsd#xyl_ScheduleOfEarningsPerShareBasicAndDilutedTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_xyl_ScheduleOfEarningsPerShareBasicAndDilutedLineItems_c5c6f66e-8e4f-4c65-8891-8f6d7bb0eaa8" xlink:to="loc_xyl_ScheduleOfEarningsPerShareBasicAndDilutedTable_5c62143b-39da-4763-9d06-2b7de6e520b6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_b1b30467-badd-45f6-86c2-ca13de915309" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_xyl_ScheduleOfEarningsPerShareBasicAndDilutedTable_5c62143b-39da-4763-9d06-2b7de6e520b6" xlink:to="loc_us-gaap_AwardTypeAxis_b1b30467-badd-45f6-86c2-ca13de915309" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b1b30467-badd-45f6-86c2-ca13de915309_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_b1b30467-badd-45f6-86c2-ca13de915309" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b1b30467-badd-45f6-86c2-ca13de915309_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e2f395ef-6195-479c-8b72-e1c141f84301" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_b1b30467-badd-45f6-86c2-ca13de915309" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e2f395ef-6195-479c-8b72-e1c141f84301" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_7f044b3f-0a61-4e17-8600-690f9414f1b8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e2f395ef-6195-479c-8b72-e1c141f84301" xlink:to="loc_us-gaap_EmployeeStockOptionMember_7f044b3f-0a61-4e17-8600-690f9414f1b8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_e6c12023-b371-4134-9eb3-1b024f884770" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e2f395ef-6195-479c-8b72-e1c141f84301" xlink:to="loc_us-gaap_RestrictedStockMember_e6c12023-b371-4134-9eb3-1b024f884770" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareReconciliationAbstract_57a91133-7ab1-4109-9094-c077f082382d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EarningsPerShareReconciliationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_xyl_ScheduleOfEarningsPerShareBasicAndDilutedLineItems_c5c6f66e-8e4f-4c65-8891-8f6d7bb0eaa8" xlink:to="loc_us-gaap_EarningsPerShareReconciliationAbstract_57a91133-7ab1-4109-9094-c077f082382d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_d4793ccc-9a60-439d-8c03-5b2bcf5934e5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareReconciliationAbstract_57a91133-7ab1-4109-9094-c077f082382d" xlink:to="loc_us-gaap_NetIncomeLoss_d4793ccc-9a60-439d-8c03-5b2bcf5934e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_ca4a8189-b43b-4010-9b8c-8925960abf8f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareReconciliationAbstract_57a91133-7ab1-4109-9094-c077f082382d" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_ca4a8189-b43b-4010-9b8c-8925960abf8f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesIssuedBasic_456b6ad8-e3c4-4ebf-98dd-739d82c9783e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_WeightedAverageNumberOfSharesIssuedBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_ca4a8189-b43b-4010-9b8c-8925960abf8f" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesIssuedBasic_456b6ad8-e3c4-4ebf-98dd-739d82c9783e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights_6d2ebb47-c099-4caf-accd-31004122f023" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_ca4a8189-b43b-4010-9b8c-8925960abf8f" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights_6d2ebb47-c099-4caf-accd-31004122f023" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_c2f41c93-6313-456a-bc34-64bdee83dd85" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_ca4a8189-b43b-4010-9b8c-8925960abf8f" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_c2f41c93-6313-456a-bc34-64bdee83dd85" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstract_f90a6fcc-8685-4084-b9d9-795da1c53941" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareReconciliationAbstract_57a91133-7ab1-4109-9094-c077f082382d" xlink:to="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstract_f90a6fcc-8685-4084-b9d9-795da1c53941" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_2a601ea5-b377-48ad-9264-1b14ce73ffeb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstract_f90a6fcc-8685-4084-b9d9-795da1c53941" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_2a601ea5-b377-48ad-9264-1b14ce73ffeb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_3b70ae7e-0008-4fdb-8b0e-72fc0fbfea99" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstract_f90a6fcc-8685-4084-b9d9-795da1c53941" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_3b70ae7e-0008-4fdb-8b0e-72fc0fbfea99" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_cd2d903c-f14b-4c61-b715-297e44dbeaeb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareReconciliationAbstract_57a91133-7ab1-4109-9094-c077f082382d" xlink:to="loc_us-gaap_EarningsPerShareBasic_cd2d903c-f14b-4c61-b715-297e44dbeaeb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_b38f57ab-b3e5-4448-b82a-557f3f50c7ab" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareReconciliationAbstract_57a91133-7ab1-4109-9094-c077f082382d" xlink:to="loc_us-gaap_EarningsPerShareDiluted_b38f57ab-b3e5-4448-b82a-557f3f50c7ab" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/EarningsPerShareSummaryofAntidilutiveSecuritiesDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#EarningsPerShareSummaryofAntidilutiveSecuritiesDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/EarningsPerShareSummaryofAntidilutiveSecuritiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_a537e1cc-80f7-4470-b478-56c8fbf26d8a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_18f0b453-cb40-4c98-82e2-de1bc84c3212" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_a537e1cc-80f7-4470-b478-56c8fbf26d8a" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_18f0b453-cb40-4c98-82e2-de1bc84c3212" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_2a0fa2ad-119b-4e91-8591-6b4076d74748" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_18f0b453-cb40-4c98-82e2-de1bc84c3212" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_2a0fa2ad-119b-4e91-8591-6b4076d74748" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_2a0fa2ad-119b-4e91-8591-6b4076d74748_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_2a0fa2ad-119b-4e91-8591-6b4076d74748" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_2a0fa2ad-119b-4e91-8591-6b4076d74748_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_ff8ea484-0b77-4081-b82b-3bb2e639b4f3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_2a0fa2ad-119b-4e91-8591-6b4076d74748" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_ff8ea484-0b77-4081-b82b-3bb2e639b4f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_845e0ecb-b702-4cea-ae43-d21539256a18" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_ff8ea484-0b77-4081-b82b-3bb2e639b4f3" xlink:to="loc_us-gaap_EmployeeStockOptionMember_845e0ecb-b702-4cea-ae43-d21539256a18" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_660dd25d-ba8e-457f-ae06-b6a49e9a7821" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_ff8ea484-0b77-4081-b82b-3bb2e639b4f3" xlink:to="loc_us-gaap_RestrictedStockMember_660dd25d-ba8e-457f-ae06-b6a49e9a7821" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_2a9cd513-31b7-4054-af54-fe533b4f61f3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_ff8ea484-0b77-4081-b82b-3bb2e639b4f3" xlink:to="loc_us-gaap_PerformanceSharesMember_2a9cd513-31b7-4054-af54-fe533b4f61f3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_0082ce3b-e00d-4c36-bc6d-65d39e4f4d05" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_a537e1cc-80f7-4470-b478-56c8fbf26d8a" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_0082ce3b-e00d-4c36-bc6d-65d39e4f4d05" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/GoodwillandOtherIntangibleAssetsGoodwillRollforwardDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#GoodwillandOtherIntangibleAssetsGoodwillRollforwardDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/GoodwillandOtherIntangibleAssetsGoodwillRollforwardDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilityPropertyPlantAndEquipmentLineItems_fec57516-1fa7-4d4f-a78e-aadf88c5171a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PublicUtilityPropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilityPropertyPlantAndEquipmentTable_b0cfa631-29f5-4753-bf64-11d7c82b9c67" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PublicUtilityPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PublicUtilityPropertyPlantAndEquipmentLineItems_fec57516-1fa7-4d4f-a78e-aadf88c5171a" xlink:to="loc_us-gaap_PublicUtilityPropertyPlantAndEquipmentTable_b0cfa631-29f5-4753-bf64-11d7c82b9c67" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_df43fe57-e5e9-4550-b16e-c62bf216c254" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PublicUtilityPropertyPlantAndEquipmentTable_b0cfa631-29f5-4753-bf64-11d7c82b9c67" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_df43fe57-e5e9-4550-b16e-c62bf216c254" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_df43fe57-e5e9-4550-b16e-c62bf216c254_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_df43fe57-e5e9-4550-b16e-c62bf216c254" xlink:to="loc_us-gaap_SegmentDomain_df43fe57-e5e9-4550-b16e-c62bf216c254_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_318ab4c4-2ce9-4da7-8640-d98bb19cec47" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_df43fe57-e5e9-4550-b16e-c62bf216c254" xlink:to="loc_us-gaap_SegmentDomain_318ab4c4-2ce9-4da7-8640-d98bb19cec47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_WaterInfrastructureMember_b2110b7b-fa7d-4648-a64b-def2b6d2b639" xlink:href="xyl-20240930.xsd#xyl_WaterInfrastructureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_318ab4c4-2ce9-4da7-8640-d98bb19cec47" xlink:to="loc_xyl_WaterInfrastructureMember_b2110b7b-fa7d-4648-a64b-def2b6d2b639" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_AppliedWaterMember_0ebdd5b7-95ed-42cc-8583-0b566d736859" xlink:href="xyl-20240930.xsd#xyl_AppliedWaterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_318ab4c4-2ce9-4da7-8640-d98bb19cec47" xlink:to="loc_xyl_AppliedWaterMember_0ebdd5b7-95ed-42cc-8583-0b566d736859" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_MeasurementandControlSolutionsMember_8252ea75-cd2c-4a53-8f03-0b37d44bee9f" xlink:href="xyl-20240930.xsd#xyl_MeasurementandControlSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_318ab4c4-2ce9-4da7-8640-d98bb19cec47" xlink:to="loc_xyl_MeasurementandControlSolutionsMember_8252ea75-cd2c-4a53-8f03-0b37d44bee9f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_WaterSolutionsAndServicesSegmentMember_4545378a-c266-4636-b1d2-8a8d07ee4cb8" xlink:href="xyl-20240930.xsd#xyl_WaterSolutionsAndServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_318ab4c4-2ce9-4da7-8640-d98bb19cec47" xlink:to="loc_xyl_WaterSolutionsAndServicesSegmentMember_4545378a-c266-4636-b1d2-8a8d07ee4cb8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonrecurringAdjustmentAxis_81d5c3f9-803d-4224-8da5-fea569918364" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NonrecurringAdjustmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PublicUtilityPropertyPlantAndEquipmentTable_b0cfa631-29f5-4753-bf64-11d7c82b9c67" xlink:to="loc_us-gaap_NonrecurringAdjustmentAxis_81d5c3f9-803d-4224-8da5-fea569918364" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonrecurringAdjustmentDomain_81d5c3f9-803d-4224-8da5-fea569918364_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NonrecurringAdjustmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_NonrecurringAdjustmentAxis_81d5c3f9-803d-4224-8da5-fea569918364" xlink:to="loc_us-gaap_NonrecurringAdjustmentDomain_81d5c3f9-803d-4224-8da5-fea569918364_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonrecurringAdjustmentDomain_cef72b23-5da0-40c2-9fdf-7952eccbd671" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NonrecurringAdjustmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_NonrecurringAdjustmentAxis_81d5c3f9-803d-4224-8da5-fea569918364" xlink:to="loc_us-gaap_NonrecurringAdjustmentDomain_cef72b23-5da0-40c2-9fdf-7952eccbd671" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_GoodwillAdjustmentDueToSegmentReallocationMember_ac517618-b79a-4b01-b4b0-5ef3f496688a" xlink:href="xyl-20240930.xsd#xyl_GoodwillAdjustmentDueToSegmentReallocationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonrecurringAdjustmentDomain_cef72b23-5da0-40c2-9fdf-7952eccbd671" xlink:to="loc_xyl_GoodwillAdjustmentDueToSegmentReallocationMember_ac517618-b79a-4b01-b4b0-5ef3f496688a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_GoodwillAdjustmentDueToSegmentReallocationAdjustedBalanceMember_c1fe5a8e-b16b-4f48-92c7-2db0f8d986ac" xlink:href="xyl-20240930.xsd#xyl_GoodwillAdjustmentDueToSegmentReallocationAdjustedBalanceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonrecurringAdjustmentDomain_cef72b23-5da0-40c2-9fdf-7952eccbd671" xlink:to="loc_xyl_GoodwillAdjustmentDueToSegmentReallocationAdjustedBalanceMember_c1fe5a8e-b16b-4f48-92c7-2db0f8d986ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_631f9c0e-f5c9-41f3-a215-77f833ddb702" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilityPropertyPlantAndEquipmentLineItems_fec57516-1fa7-4d4f-a78e-aadf88c5171a" xlink:to="loc_us-gaap_GoodwillRollForward_631f9c0e-f5c9-41f3-a215-77f833ddb702" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_e80436d6-591e-41e3-8b36-7b70444f626b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_631f9c0e-f5c9-41f3-a215-77f833ddb702" xlink:to="loc_us-gaap_Goodwill_e80436d6-591e-41e3-8b36-7b70444f626b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_GoodwillReallocationDueToChangeInReportableSegments_47d338f2-999b-47d9-8563-c47b7b90ce04" xlink:href="xyl-20240930.xsd#xyl_GoodwillReallocationDueToChangeInReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_631f9c0e-f5c9-41f3-a215-77f833ddb702" xlink:to="loc_xyl_GoodwillReallocationDueToChangeInReportableSegments_47d338f2-999b-47d9-8563-c47b7b90ce04" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_5eaa5d45-e167-4541-8117-88811e7c0ad4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_631f9c0e-f5c9-41f3-a215-77f833ddb702" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_5eaa5d45-e167-4541-8117-88811e7c0ad4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_d8c31e0e-e257-4c18-af51-a80dd28e1cc7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Goodwill"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/GoodwillandOtherIntangibleAssetsSummaryofIntangibleAssetsDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#GoodwillandOtherIntangibleAssetsSummaryofIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/GoodwillandOtherIntangibleAssetsSummaryofIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_f1ad21b4-e48c-4eae-a1e6-3a67fe268c17" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_5388be80-e9f8-4af1-9fe0-13801fe373dc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_f1ad21b4-e48c-4eae-a1e6-3a67fe268c17" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_5388be80-e9f8-4af1-9fe0-13801fe373dc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_bb7681a3-99ae-42e2-b398-16fa75b2f7e5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_5388be80-e9f8-4af1-9fe0-13801fe373dc" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_bb7681a3-99ae-42e2-b398-16fa75b2f7e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_bb7681a3-99ae-42e2-b398-16fa75b2f7e5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_bb7681a3-99ae-42e2-b398-16fa75b2f7e5" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_bb7681a3-99ae-42e2-b398-16fa75b2f7e5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_cf637682-2f0e-4d27-a1be-e35cf211e8cb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_bb7681a3-99ae-42e2-b398-16fa75b2f7e5" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_cf637682-2f0e-4d27-a1be-e35cf211e8cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_36b4cc97-60f6-4133-a015-2cc353d4af5b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_cf637682-2f0e-4d27-a1be-e35cf211e8cb" xlink:to="loc_us-gaap_CustomerRelationshipsMember_36b4cc97-60f6-4133-a015-2cc353d4af5b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_ProprietaryandPatentedTechnologyMember_19906097-a224-45a5-b6de-93655084fcc1" xlink:href="xyl-20240930.xsd#xyl_ProprietaryandPatentedTechnologyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_cf637682-2f0e-4d27-a1be-e35cf211e8cb" xlink:to="loc_xyl_ProprietaryandPatentedTechnologyMember_19906097-a224-45a5-b6de-93655084fcc1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksMember_81f0a451-4e26-4f31-aeac-6cf8ab79ac67" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TrademarksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_cf637682-2f0e-4d27-a1be-e35cf211e8cb" xlink:to="loc_us-gaap_TrademarksMember_81f0a451-4e26-4f31-aeac-6cf8ab79ac67" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareDevelopmentMember_adf80a00-ff33-440e-b545-157889fca2d4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SoftwareDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_cf637682-2f0e-4d27-a1be-e35cf211e8cb" xlink:to="loc_us-gaap_SoftwareDevelopmentMember_adf80a00-ff33-440e-b545-157889fca2d4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_a924031e-b043-4f1e-9f75-eaeb6a073a50" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_cf637682-2f0e-4d27-a1be-e35cf211e8cb" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_a924031e-b043-4f1e-9f75-eaeb6a073a50" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnclassifiedIndefinitelivedIntangibleAssetsMember_d56532e2-3359-43ce-82b5-5131342bdf0d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_UnclassifiedIndefinitelivedIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_cf637682-2f0e-4d27-a1be-e35cf211e8cb" xlink:to="loc_us-gaap_UnclassifiedIndefinitelivedIntangibleAssetsMember_d56532e2-3359-43ce-82b5-5131342bdf0d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract_521a3016-cdcf-4b10-88aa-b143c39b9569" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_f1ad21b4-e48c-4eae-a1e6-3a67fe268c17" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract_521a3016-cdcf-4b10-88aa-b143c39b9569" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_9738f644-3a29-471c-a66f-ad03dbe6bec6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract_521a3016-cdcf-4b10-88aa-b143c39b9569" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_9738f644-3a29-471c-a66f-ad03dbe6bec6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_edaec05d-bf96-4144-96f9-7ff728635965" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract_521a3016-cdcf-4b10-88aa-b143c39b9569" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_edaec05d-bf96-4144-96f9-7ff728635965" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_03033abc-c931-4527-8082-4f25ff240929" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract_521a3016-cdcf-4b10-88aa-b143c39b9569" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_03033abc-c931-4527-8082-4f25ff240929" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_4c9f29cd-843f-4110-8149-91f00636fc0f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract_521a3016-cdcf-4b10-88aa-b143c39b9569" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_4c9f29cd-843f-4110-8149-91f00636fc0f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_4a23ff8d-7c4e-4c8c-9679-3bc182a07175" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract_521a3016-cdcf-4b10-88aa-b143c39b9569" xlink:to="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_4a23ff8d-7c4e-4c8c-9679-3bc182a07175" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_c813e311-6acd-467b-930c-ef74cd416f34" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract_521a3016-cdcf-4b10-88aa-b143c39b9569" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_c813e311-6acd-467b-930c-ef74cd416f34" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/GoodwillandOtherIntangibleAssetsTextualDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#GoodwillandOtherIntangibleAssetsTextualDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/GoodwillandOtherIntangibleAssetsTextualDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_aed13a28-243e-4f95-970c-ae52ab32d1a9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f09afef4-4750-4537-9f12-d90022c558a2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_aed13a28-243e-4f95-970c-ae52ab32d1a9" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f09afef4-4750-4537-9f12-d90022c558a2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_edb9e341-fee9-4941-83e2-c77afab72c21" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f09afef4-4750-4537-9f12-d90022c558a2" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_edb9e341-fee9-4941-83e2-c77afab72c21" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_edb9e341-fee9-4941-83e2-c77afab72c21_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_edb9e341-fee9-4941-83e2-c77afab72c21" xlink:to="loc_us-gaap_SegmentDomain_edb9e341-fee9-4941-83e2-c77afab72c21_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_3f03088b-cfb1-40c7-83f4-a0f9d7af35e3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_edb9e341-fee9-4941-83e2-c77afab72c21" xlink:to="loc_us-gaap_SegmentDomain_3f03088b-cfb1-40c7-83f4-a0f9d7af35e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_MeasurementandControlSolutionsMember_93595699-b65f-4ec7-8700-78ee65f97bbf" xlink:href="xyl-20240930.xsd#xyl_MeasurementandControlSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_3f03088b-cfb1-40c7-83f4-a0f9d7af35e3" xlink:to="loc_xyl_MeasurementandControlSolutionsMember_93595699-b65f-4ec7-8700-78ee65f97bbf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_WaterSolutionsAndServicesSegmentMember_465cf505-531f-4981-b6a7-e912f7b180ec" xlink:href="xyl-20240930.xsd#xyl_WaterSolutionsAndServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_3f03088b-cfb1-40c7-83f4-a0f9d7af35e3" xlink:to="loc_xyl_WaterSolutionsAndServicesSegmentMember_465cf505-531f-4981-b6a7-e912f7b180ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_31445433-70e0-4d04-bee6-3630f39ae204" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f09afef4-4750-4537-9f12-d90022c558a2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_31445433-70e0-4d04-bee6-3630f39ae204" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_31445433-70e0-4d04-bee6-3630f39ae204_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_31445433-70e0-4d04-bee6-3630f39ae204" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_31445433-70e0-4d04-bee6-3630f39ae204_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_ac76c3f6-230a-4b36-a8cb-7f53a3232217" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_31445433-70e0-4d04-bee6-3630f39ae204" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_ac76c3f6-230a-4b36-a8cb-7f53a3232217" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareDevelopmentMember_15f760b5-d97c-41ef-b76d-1395a59889d8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SoftwareDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_ac76c3f6-230a-4b36-a8cb-7f53a3232217" xlink:to="loc_us-gaap_SoftwareDevelopmentMember_15f760b5-d97c-41ef-b76d-1395a59889d8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_CustomerRelationshipsAndTrademarksMember_fbd6b3ae-0489-48fe-beb0-c59468d7e202" xlink:href="xyl-20240930.xsd#xyl_CustomerRelationshipsAndTrademarksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_ac76c3f6-230a-4b36-a8cb-7f53a3232217" xlink:to="loc_xyl_CustomerRelationshipsAndTrademarksMember_fbd6b3ae-0489-48fe-beb0-c59468d7e202" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_e483e06c-75e7-42f2-bf99-bdefdb06d808" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_aed13a28-243e-4f95-970c-ae52ab32d1a9" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_e483e06c-75e7-42f2-bf99-bdefdb06d808" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetImpairmentCharges_c2797542-b544-4591-b56d-c6093380a160" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_aed13a28-243e-4f95-970c-ae52ab32d1a9" xlink:to="loc_us-gaap_AssetImpairmentCharges_c2797542-b544-4591-b56d-c6093380a160" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/DerivativeFinancialInstrumentsEffectofDeriativeInstrumentsonIncomeStatementandStatementofComprehensiveIncomeDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#DerivativeFinancialInstrumentsEffectofDeriativeInstrumentsonIncomeStatementandStatementofComprehensiveIncomeDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/DerivativeFinancialInstrumentsEffectofDeriativeInstrumentsonIncomeStatementandStatementofComprehensiveIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_a75aed77-0af1-4a64-a2bc-8c44cab8f418" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_4fbfb1a4-76a6-4310-bf40-238e616d45e2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_a75aed77-0af1-4a64-a2bc-8c44cab8f418" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_4fbfb1a4-76a6-4310-bf40-238e616d45e2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_f8fa78cf-c165-4efd-aea2-5a6fc37ca372" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_4fbfb1a4-76a6-4310-bf40-238e616d45e2" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_f8fa78cf-c165-4efd-aea2-5a6fc37ca372" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_f8fa78cf-c165-4efd-aea2-5a6fc37ca372_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_f8fa78cf-c165-4efd-aea2-5a6fc37ca372" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_f8fa78cf-c165-4efd-aea2-5a6fc37ca372_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_3fd2b849-4104-49b3-bce5-3d9d535fa20e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_f8fa78cf-c165-4efd-aea2-5a6fc37ca372" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_3fd2b849-4104-49b3-bce5-3d9d535fa20e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseMember_7bc6efd7-6d7c-461c-9f7a-a4b2cfe23290" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InterestExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_3fd2b849-4104-49b3-bce5-3d9d535fa20e" xlink:to="loc_us-gaap_InterestExpenseMember_7bc6efd7-6d7c-461c-9f7a-a4b2cfe23290" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLocationAxis_67938141-cfbf-457a-862f-7792fae01262" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherComprehensiveIncomeLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_4fbfb1a4-76a6-4310-bf40-238e616d45e2" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLocationAxis_67938141-cfbf-457a-862f-7792fae01262" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLocationDomain_67938141-cfbf-457a-862f-7792fae01262_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherComprehensiveIncomeLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLocationAxis_67938141-cfbf-457a-862f-7792fae01262" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLocationDomain_67938141-cfbf-457a-862f-7792fae01262_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLocationDomain_21f2ea20-74e1-4949-962f-0c2977d6c73d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherComprehensiveIncomeLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLocationAxis_67938141-cfbf-457a-862f-7792fae01262" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLocationDomain_21f2ea20-74e1-4949-962f-0c2977d6c73d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeMember_5f552277-35a7-4a9c-b4ea-afd99440e7a4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLocationDomain_21f2ea20-74e1-4949-962f-0c2977d6c73d" xlink:to="loc_us-gaap_OtherComprehensiveIncomeMember_5f552277-35a7-4a9c-b4ea-afd99440e7a4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_cd48441e-6c3a-449f-af28-e4908e1bd044" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_4fbfb1a4-76a6-4310-bf40-238e616d45e2" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_cd48441e-6c3a-449f-af28-e4908e1bd044" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_cd48441e-6c3a-449f-af28-e4908e1bd044_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_cd48441e-6c3a-449f-af28-e4908e1bd044" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_cd48441e-6c3a-449f-af28-e4908e1bd044_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_65532cb5-7b67-41f9-ac24-ca0b1a176c92" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_cd48441e-6c3a-449f-af28-e4908e1bd044" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_65532cb5-7b67-41f9-ac24-ca0b1a176c92" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_7adf2490-3758-484b-a00c-fd0fcd6a79df" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_65532cb5-7b67-41f9-ac24-ca0b1a176c92" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_7adf2490-3758-484b-a00c-fd0fcd6a79df" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_5ed5773f-3ad3-42de-a01f-2cacbebbc201" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_4fbfb1a4-76a6-4310-bf40-238e616d45e2" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_5ed5773f-3ad3-42de-a01f-2cacbebbc201" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_5ed5773f-3ad3-42de-a01f-2cacbebbc201_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_5ed5773f-3ad3-42de-a01f-2cacbebbc201" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_5ed5773f-3ad3-42de-a01f-2cacbebbc201_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_ccdd1d23-b525-4f50-9fba-10dad3c2e1cf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_5ed5773f-3ad3-42de-a01f-2cacbebbc201" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_ccdd1d23-b525-4f50-9fba-10dad3c2e1cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_b455f19a-4a3d-4b9d-abca-0430b75d0f74" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_ccdd1d23-b525-4f50-9fba-10dad3c2e1cf" xlink:to="loc_us-gaap_ForeignExchangeContractMember_b455f19a-4a3d-4b9d-abca-0430b75d0f74" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CrossCurrencyInterestRateContractMember_cd4ffdfc-9b67-429e-8a04-3dff7b76b86d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CrossCurrencyInterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_ccdd1d23-b525-4f50-9fba-10dad3c2e1cf" xlink:to="loc_us-gaap_CrossCurrencyInterestRateContractMember_cd4ffdfc-9b67-429e-8a04-3dff7b76b86d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_958cadb8-4c8a-4d17-86b7-df7b56eb548e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_4fbfb1a4-76a6-4310-bf40-238e616d45e2" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_958cadb8-4c8a-4d17-86b7-df7b56eb548e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_958cadb8-4c8a-4d17-86b7-df7b56eb548e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_958cadb8-4c8a-4d17-86b7-df7b56eb548e" xlink:to="loc_us-gaap_HedgingRelationshipDomain_958cadb8-4c8a-4d17-86b7-df7b56eb548e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_214b9b88-5fbe-480f-a315-00c4080ba72b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_958cadb8-4c8a-4d17-86b7-df7b56eb548e" xlink:to="loc_us-gaap_HedgingRelationshipDomain_214b9b88-5fbe-480f-a315-00c4080ba72b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_407d7222-afd6-4d79-9f20-f8c19722d2fb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_214b9b88-5fbe-480f-a315-00c4080ba72b" xlink:to="loc_us-gaap_CashFlowHedgingMember_407d7222-afd6-4d79-9f20-f8c19722d2fb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_DerivativeInstrumentsGainsLossesInStatementOfFinancialPerformanceAbstract_e5081c05-104e-48a0-8c5e-d81d6662e271" xlink:href="xyl-20240930.xsd#xyl_DerivativeInstrumentsGainsLossesInStatementOfFinancialPerformanceAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_a75aed77-0af1-4a64-a2bc-8c44cab8f418" xlink:to="loc_xyl_DerivativeInstrumentsGainsLossesInStatementOfFinancialPerformanceAbstract_e5081c05-104e-48a0-8c5e-d81d6662e271" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainLossOnForeignCurrencyDerivativesNetBeforeTax_709cd0b2-5fc1-49fc-873a-b445ae7d095d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_UnrealizedGainLossOnForeignCurrencyDerivativesNetBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_xyl_DerivativeInstrumentsGainsLossesInStatementOfFinancialPerformanceAbstract_e5081c05-104e-48a0-8c5e-d81d6662e271" xlink:to="loc_us-gaap_UnrealizedGainLossOnForeignCurrencyDerivativesNetBeforeTax_709cd0b2-5fc1-49fc-873a-b445ae7d095d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_da4d3c03-17bb-4411-a5ee-e2a750725ace" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_xyl_DerivativeInstrumentsGainsLossesInStatementOfFinancialPerformanceAbstract_e5081c05-104e-48a0-8c5e-d81d6662e271" xlink:to="loc_us-gaap_Revenues_da4d3c03-17bb-4411-a5ee-e2a750725ace" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_df04971f-4b9b-4aeb-9268-7985d58a0c93" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_xyl_DerivativeInstrumentsGainsLossesInStatementOfFinancialPerformanceAbstract_e5081c05-104e-48a0-8c5e-d81d6662e271" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_df04971f-4b9b-4aeb-9268-7985d58a0c93" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/DerivativeFinancialInstrumentsBalanceSheetLocationofDerivativeInstrumentsDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#DerivativeFinancialInstrumentsBalanceSheetLocationofDerivativeInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/DerivativeFinancialInstrumentsBalanceSheetLocationofDerivativeInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_83edb16c-eb55-4e1c-a88c-67f413ffff91" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativesFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_410f6f82-c4e7-489e-9f15-d68857676b41" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_83edb16c-eb55-4e1c-a88c-67f413ffff91" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_410f6f82-c4e7-489e-9f15-d68857676b41" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_63975833-da89-4909-9c52-9dc4aaa80453" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_410f6f82-c4e7-489e-9f15-d68857676b41" xlink:to="loc_us-gaap_HedgingDesignationAxis_63975833-da89-4909-9c52-9dc4aaa80453" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_63975833-da89-4909-9c52-9dc4aaa80453_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_63975833-da89-4909-9c52-9dc4aaa80453" xlink:to="loc_us-gaap_HedgingDesignationDomain_63975833-da89-4909-9c52-9dc4aaa80453_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_4fd1a547-c167-4ef5-b8a6-7e8e42fbb40f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_63975833-da89-4909-9c52-9dc4aaa80453" xlink:to="loc_us-gaap_HedgingDesignationDomain_4fd1a547-c167-4ef5-b8a6-7e8e42fbb40f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_237f14e9-285d-4d8e-886d-f58a813740ad" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_4fd1a547-c167-4ef5-b8a6-7e8e42fbb40f" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_237f14e9-285d-4d8e-886d-f58a813740ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_42db712c-5e07-40f5-a073-b680a88ebdfa" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_410f6f82-c4e7-489e-9f15-d68857676b41" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_42db712c-5e07-40f5-a073-b680a88ebdfa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_42db712c-5e07-40f5-a073-b680a88ebdfa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_42db712c-5e07-40f5-a073-b680a88ebdfa" xlink:to="loc_us-gaap_HedgingRelationshipDomain_42db712c-5e07-40f5-a073-b680a88ebdfa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_33596c7d-ff0f-49ac-b049-a35042bc5328" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_42db712c-5e07-40f5-a073-b680a88ebdfa" xlink:to="loc_us-gaap_HedgingRelationshipDomain_33596c7d-ff0f-49ac-b049-a35042bc5328" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_c9a9e103-f42a-4a82-a61f-7bc169bf0c2e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_33596c7d-ff0f-49ac-b049-a35042bc5328" xlink:to="loc_us-gaap_CashFlowHedgingMember_c9a9e103-f42a-4a82-a61f-7bc169bf0c2e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfFinancialPositionLocationActivityAccrualAxis_912e7c70-55a5-4c8a-99cb-8fb4540985b5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementOfFinancialPositionLocationActivityAccrualAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_410f6f82-c4e7-489e-9f15-d68857676b41" xlink:to="loc_us-gaap_StatementOfFinancialPositionLocationActivityAccrualAxis_912e7c70-55a5-4c8a-99cb-8fb4540985b5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfFinancialPositionLocationActivityAccrualDomain_912e7c70-55a5-4c8a-99cb-8fb4540985b5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementOfFinancialPositionLocationActivityAccrualDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementOfFinancialPositionLocationActivityAccrualAxis_912e7c70-55a5-4c8a-99cb-8fb4540985b5" xlink:to="loc_us-gaap_StatementOfFinancialPositionLocationActivityAccrualDomain_912e7c70-55a5-4c8a-99cb-8fb4540985b5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfFinancialPositionLocationActivityAccrualDomain_1440a7d8-dd61-4639-999e-97ff73f655ab" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementOfFinancialPositionLocationActivityAccrualDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementOfFinancialPositionLocationActivityAccrualAxis_912e7c70-55a5-4c8a-99cb-8fb4540985b5" xlink:to="loc_us-gaap_StatementOfFinancialPositionLocationActivityAccrualDomain_1440a7d8-dd61-4639-999e-97ff73f655ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_b8bb71fb-16dd-40a5-85aa-795c72f7cb2f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_410f6f82-c4e7-489e-9f15-d68857676b41" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_b8bb71fb-16dd-40a5-85aa-795c72f7cb2f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_b8bb71fb-16dd-40a5-85aa-795c72f7cb2f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_b8bb71fb-16dd-40a5-85aa-795c72f7cb2f" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_b8bb71fb-16dd-40a5-85aa-795c72f7cb2f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_f99c8534-728d-4c0c-a397-d2a0c8abffc1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_b8bb71fb-16dd-40a5-85aa-795c72f7cb2f" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_f99c8534-728d-4c0c-a397-d2a0c8abffc1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentAssetsMember_9482a36d-4e2d-4589-aa32-00f3da3d4183" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherCurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_f99c8534-728d-4c0c-a397-d2a0c8abffc1" xlink:to="loc_us-gaap_OtherCurrentAssetsMember_9482a36d-4e2d-4589-aa32-00f3da3d4183" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentAssetsMember_8757e0b2-845e-408d-af03-a16431a32be5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherNoncurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_f99c8534-728d-4c0c-a397-d2a0c8abffc1" xlink:to="loc_us-gaap_OtherNoncurrentAssetsMember_8757e0b2-845e-408d-af03-a16431a32be5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentLiabilitiesMember_523c0350-f62d-4d98-93ef-90a579f805d4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherCurrentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_f99c8534-728d-4c0c-a397-d2a0c8abffc1" xlink:to="loc_us-gaap_OtherCurrentLiabilitiesMember_523c0350-f62d-4d98-93ef-90a579f805d4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentLiabilitiesMember_0aac81d7-06f0-4f9e-96e0-70facf9826b6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherNoncurrentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_f99c8534-728d-4c0c-a397-d2a0c8abffc1" xlink:to="loc_us-gaap_OtherNoncurrentLiabilitiesMember_0aac81d7-06f0-4f9e-96e0-70facf9826b6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyCashFlowHedgeAssetAtFairValue_31dcc6d0-b7bf-4e31-b5cc-349b5e0cea75" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ForeignCurrencyCashFlowHedgeAssetAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_83edb16c-eb55-4e1c-a88c-67f413ffff91" xlink:to="loc_us-gaap_ForeignCurrencyCashFlowHedgeAssetAtFairValue_31dcc6d0-b7bf-4e31-b5cc-349b5e0cea75" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyCashFlowHedgeLiabilityAtFairValue_08b3f8eb-972d-4e4a-b010-21c7c4d8347b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ForeignCurrencyCashFlowHedgeLiabilityAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_83edb16c-eb55-4e1c-a88c-67f413ffff91" xlink:to="loc_us-gaap_ForeignCurrencyCashFlowHedgeLiabilityAtFairValue_08b3f8eb-972d-4e4a-b010-21c7c4d8347b" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/DerivativeFinancialInstrumentsTextualDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#DerivativeFinancialInstrumentsTextualDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/DerivativeFinancialInstrumentsTextualDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_563d3834-5c5d-4d09-a8ef-d676413d1b31" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_f06b88b9-d12a-4901-bf19-71dc7f830071" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_563d3834-5c5d-4d09-a8ef-d676413d1b31" xlink:to="loc_us-gaap_DerivativeTable_f06b88b9-d12a-4901-bf19-71dc7f830071" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_462e28a3-e7f7-4893-a8b2-031c00a7b6b8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_f06b88b9-d12a-4901-bf19-71dc7f830071" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_462e28a3-e7f7-4893-a8b2-031c00a7b6b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_462e28a3-e7f7-4893-a8b2-031c00a7b6b8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_462e28a3-e7f7-4893-a8b2-031c00a7b6b8" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_462e28a3-e7f7-4893-a8b2-031c00a7b6b8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_53061809-2033-4a7e-b18d-6d43485b3c97" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_462e28a3-e7f7-4893-a8b2-031c00a7b6b8" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_53061809-2033-4a7e-b18d-6d43485b3c97" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_b3b4310b-f83e-4dde-a2e7-641e3c92e4b8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_53061809-2033-4a7e-b18d-6d43485b3c97" xlink:to="loc_us-gaap_SeniorNotesMember_b3b4310b-f83e-4dde-a2e7-641e3c92e4b8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_12ce78dd-fdfe-4b53-95d2-e2046eaf33af" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_f06b88b9-d12a-4901-bf19-71dc7f830071" xlink:to="loc_us-gaap_HedgingDesignationAxis_12ce78dd-fdfe-4b53-95d2-e2046eaf33af" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_12ce78dd-fdfe-4b53-95d2-e2046eaf33af_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_12ce78dd-fdfe-4b53-95d2-e2046eaf33af" xlink:to="loc_us-gaap_HedgingDesignationDomain_12ce78dd-fdfe-4b53-95d2-e2046eaf33af_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_1e928e6c-a1f9-40a0-97ef-f249bfe8b58a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_12ce78dd-fdfe-4b53-95d2-e2046eaf33af" xlink:to="loc_us-gaap_HedgingDesignationDomain_1e928e6c-a1f9-40a0-97ef-f249bfe8b58a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_f42363a6-d3da-4fd4-963b-2a8694e84f05" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_1e928e6c-a1f9-40a0-97ef-f249bfe8b58a" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_f42363a6-d3da-4fd4-963b-2a8694e84f05" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_7de13c1f-75f2-4ee2-993f-0b04976cb98a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_f06b88b9-d12a-4901-bf19-71dc7f830071" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_7de13c1f-75f2-4ee2-993f-0b04976cb98a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_7de13c1f-75f2-4ee2-993f-0b04976cb98a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_7de13c1f-75f2-4ee2-993f-0b04976cb98a" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_7de13c1f-75f2-4ee2-993f-0b04976cb98a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_823a3c54-6463-425a-abd7-b7baaeb2ae74" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_7de13c1f-75f2-4ee2-993f-0b04976cb98a" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_823a3c54-6463-425a-abd7-b7baaeb2ae74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_e491645d-78b7-41f8-8394-8cd917072873" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_823a3c54-6463-425a-abd7-b7baaeb2ae74" xlink:to="loc_us-gaap_ForeignExchangeContractMember_e491645d-78b7-41f8-8394-8cd917072873" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_SellUSDBuyEURMember_97f391b3-ac14-42ca-8b8e-2748484ebb90" xlink:href="xyl-20240930.xsd#xyl_SellUSDBuyEURMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ForeignExchangeContractMember_e491645d-78b7-41f8-8394-8cd917072873" xlink:to="loc_xyl_SellUSDBuyEURMember_97f391b3-ac14-42ca-8b8e-2748484ebb90" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_BuyKRSellEURMember_8fcee36f-1f23-441b-9bf6-e681a84e7b17" xlink:href="xyl-20240930.xsd#xyl_BuyKRSellEURMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ForeignExchangeContractMember_e491645d-78b7-41f8-8394-8cd917072873" xlink:to="loc_xyl_BuyKRSellEURMember_8fcee36f-1f23-441b-9bf6-e681a84e7b17" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_SellGBPBuyEURMember_74be932e-986f-4977-85d6-1aa8bc8dd8c9" xlink:href="xyl-20240930.xsd#xyl_SellGBPBuyEURMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ForeignExchangeContractMember_e491645d-78b7-41f8-8394-8cd917072873" xlink:to="loc_xyl_SellGBPBuyEURMember_74be932e-986f-4977-85d6-1aa8bc8dd8c9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_BuyUSDSellCNYMember_d4cba723-ec63-4bf1-ab08-2835a95a8ade" xlink:href="xyl-20240930.xsd#xyl_BuyUSDSellCNYMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ForeignExchangeContractMember_e491645d-78b7-41f8-8394-8cd917072873" xlink:to="loc_xyl_BuyUSDSellCNYMember_d4cba723-ec63-4bf1-ab08-2835a95a8ade" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_BuyPLNSellEURMember_371015c0-48b0-4a11-8deb-2e9bf1eb4c00" xlink:href="xyl-20240930.xsd#xyl_BuyPLNSellEURMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ForeignExchangeContractMember_e491645d-78b7-41f8-8394-8cd917072873" xlink:to="loc_xyl_BuyPLNSellEURMember_371015c0-48b0-4a11-8deb-2e9bf1eb4c00" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_BuyUSDSellCDNMember_3807c9aa-e772-455f-93f4-95449e068830" xlink:href="xyl-20240930.xsd#xyl_BuyUSDSellCDNMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ForeignExchangeContractMember_e491645d-78b7-41f8-8394-8cd917072873" xlink:to="loc_xyl_BuyUSDSellCDNMember_3807c9aa-e772-455f-93f4-95449e068830" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_SellCNDBuyEURMember_6d07a7e0-8434-494c-bf72-dad012d87434" xlink:href="xyl-20240930.xsd#xyl_SellCNDBuyEURMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ForeignExchangeContractMember_e491645d-78b7-41f8-8394-8cd917072873" xlink:to="loc_xyl_SellCNDBuyEURMember_6d07a7e0-8434-494c-bf72-dad012d87434" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_BuyAUDSellEURMember_38a16a2e-e4b2-4e07-84a5-acec70457946" xlink:href="xyl-20240930.xsd#xyl_BuyAUDSellEURMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ForeignExchangeContractMember_e491645d-78b7-41f8-8394-8cd917072873" xlink:to="loc_xyl_BuyAUDSellEURMember_38a16a2e-e4b2-4e07-84a5-acec70457946" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CrossCurrencyInterestRateContractMember_ed746694-42e8-4924-a5e6-e2575a6d73ad" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CrossCurrencyInterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_823a3c54-6463-425a-abd7-b7baaeb2ae74" xlink:to="loc_us-gaap_CrossCurrencyInterestRateContractMember_ed746694-42e8-4924-a5e6-e2575a6d73ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_703f21ec-ded1-4132-9168-28072389feee" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_823a3c54-6463-425a-abd7-b7baaeb2ae74" xlink:to="loc_us-gaap_InterestRateSwapMember_703f21ec-ded1-4132-9168-28072389feee" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_SellAUDBuyEURMember_f0ca0f34-1ee3-4a2e-bd18-c6f4d2346e1f" xlink:href="xyl-20240930.xsd#xyl_SellAUDBuyEURMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_823a3c54-6463-425a-abd7-b7baaeb2ae74" xlink:to="loc_xyl_SellAUDBuyEURMember_f0ca0f34-1ee3-4a2e-bd18-c6f4d2346e1f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_22dda632-0f26-450d-a7fc-a003cfa526d6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_563d3834-5c5d-4d09-a8ef-d676413d1b31" xlink:to="loc_us-gaap_DerivativeNotionalAmount_22dda632-0f26-450d-a7fc-a003cfa526d6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_c9ba02bb-23d1-42a9-b0ee-2b03637b165b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_563d3834-5c5d-4d09-a8ef-d676413d1b31" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_c9ba02bb-23d1-42a9-b0ee-2b03637b165b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_9671897c-e2a0-40ad-94aa-aaebb7f97e67" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_563d3834-5c5d-4d09-a8ef-d676413d1b31" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_9671897c-e2a0-40ad-94aa-aaebb7f97e67" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNext12Months_8efef74c-f422-44bb-bbb8-c977f2ead8cd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNext12Months"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_563d3834-5c5d-4d09-a8ef-d676413d1b31" xlink:to="loc_us-gaap_ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNext12Months_8efef74c-f422-44bb-bbb8-c977f2ead8cd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSalesOfAssetsInvestingActivities_8de264a1-1d85-4dda-8362-1d5ba4821f59" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProceedsFromSalesOfAssetsInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_563d3834-5c5d-4d09-a8ef-d676413d1b31" xlink:to="loc_us-gaap_ProceedsFromSalesOfAssetsInvestingActivities_8de264a1-1d85-4dda-8362-1d5ba4821f59" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/CreditFacilitiesandDebtSummaryofDebtOutstandingDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#CreditFacilitiesandDebtSummaryofDebtOutstandingDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/CreditFacilitiesandDebtSummaryofDebtOutstandingDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_1d730b6a-0d19-43f1-b720-ed321e172bc0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_10ff1d13-3483-4a0d-af19-3d21c00831da" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1d730b6a-0d19-43f1-b720-ed321e172bc0" xlink:to="loc_us-gaap_DebtInstrumentTable_10ff1d13-3483-4a0d-af19-3d21c00831da" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_070d2771-60fb-45c3-a775-8da646738033" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_10ff1d13-3483-4a0d-af19-3d21c00831da" xlink:to="loc_us-gaap_DebtInstrumentAxis_070d2771-60fb-45c3-a775-8da646738033" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_070d2771-60fb-45c3-a775-8da646738033_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_070d2771-60fb-45c3-a775-8da646738033" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_070d2771-60fb-45c3-a775-8da646738033_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_00d9369a-9f61-4915-af42-57e022f7272f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_070d2771-60fb-45c3-a775-8da646738033" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_00d9369a-9f61-4915-af42-57e022f7272f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_SeniorNotesDueTwoThousandTwentySixMember_59ba3f9f-5c12-4a94-9694-28adaefae9e3" xlink:href="xyl-20240930.xsd#xyl_SeniorNotesDueTwoThousandTwentySixMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_00d9369a-9f61-4915-af42-57e022f7272f" xlink:to="loc_xyl_SeniorNotesDueTwoThousandTwentySixMember_59ba3f9f-5c12-4a94-9694-28adaefae9e3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_SeniorNotesDueTwentyTwentyEightMember_426eef3d-87bf-4242-a674-c79bd83deb1d" xlink:href="xyl-20240930.xsd#xyl_SeniorNotesDueTwentyTwentyEightMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_00d9369a-9f61-4915-af42-57e022f7272f" xlink:to="loc_xyl_SeniorNotesDueTwentyTwentyEightMember_426eef3d-87bf-4242-a674-c79bd83deb1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_SeniorNotesDueTwentyThirtyOneMember_b2cbc6c9-42b6-4958-ab17-cd34e778d7b0" xlink:href="xyl-20240930.xsd#xyl_SeniorNotesDueTwentyThirtyOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_00d9369a-9f61-4915-af42-57e022f7272f" xlink:to="loc_xyl_SeniorNotesDueTwentyThirtyOneMember_b2cbc6c9-42b6-4958-ab17-cd34e778d7b0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_SeniorNotesDueTwoThousandFortySixMember_42677af8-314c-42fc-bf02-2cc5c43aca6e" xlink:href="xyl-20240930.xsd#xyl_SeniorNotesDueTwoThousandFortySixMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_00d9369a-9f61-4915-af42-57e022f7272f" xlink:to="loc_xyl_SeniorNotesDueTwoThousandFortySixMember_42677af8-314c-42fc-bf02-2cc5c43aca6e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_EquipmentFinancingMember_0ab7477a-dfe7-47cc-9f6e-4c2c7b2358c3" xlink:href="xyl-20240930.xsd#xyl_EquipmentFinancingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_00d9369a-9f61-4915-af42-57e022f7272f" xlink:to="loc_xyl_EquipmentFinancingMember_0ab7477a-dfe7-47cc-9f6e-4c2c7b2358c3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_TermLoanMember_f1a9da34-6ea7-4f6f-a3ef-9c1ca3330f72" xlink:href="xyl-20240930.xsd#xyl_TermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_00d9369a-9f61-4915-af42-57e022f7272f" xlink:to="loc_xyl_TermLoanMember_f1a9da34-6ea7-4f6f-a3ef-9c1ca3330f72" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_1d472999-5d89-4f84-bdb1-4ef4618ce61e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_10ff1d13-3483-4a0d-af19-3d21c00831da" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_1d472999-5d89-4f84-bdb1-4ef4618ce61e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_1d472999-5d89-4f84-bdb1-4ef4618ce61e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_1d472999-5d89-4f84-bdb1-4ef4618ce61e" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_1d472999-5d89-4f84-bdb1-4ef4618ce61e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_602add9d-ccca-4872-aa6f-9aee24aae809" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_1d472999-5d89-4f84-bdb1-4ef4618ce61e" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_602add9d-ccca-4872-aa6f-9aee24aae809" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_168a614c-bee0-4fb0-8650-109d3bd13884" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_602add9d-ccca-4872-aa6f-9aee24aae809" xlink:to="loc_us-gaap_SecuredDebtMember_168a614c-bee0-4fb0-8650-109d3bd13884" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorLoansMember_bf786968-a8f1-4d40-8ab9-314c4d781145" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SeniorLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_602add9d-ccca-4872-aa6f-9aee24aae809" xlink:to="loc_us-gaap_SeniorLoansMember_bf786968-a8f1-4d40-8ab9-314c4d781145" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtByCurrentAndNoncurrentAbstract_d4a2d756-57bd-46ea-8408-636cf75c0c4a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongTermDebtByCurrentAndNoncurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1d730b6a-0d19-43f1-b720-ed321e172bc0" xlink:to="loc_us-gaap_LongTermDebtByCurrentAndNoncurrentAbstract_d4a2d756-57bd-46ea-8408-636cf75c0c4a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_1ab2146f-c64e-408c-8f7c-fd5cdb7d1eb7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtByCurrentAndNoncurrentAbstract_d4a2d756-57bd-46ea-8408-636cf75c0c4a" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_1ab2146f-c64e-408c-8f7c-fd5cdb7d1eb7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_069e8bb8-bc69-4d56-a77d-ffb25d6361da" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtByCurrentAndNoncurrentAbstract_d4a2d756-57bd-46ea-8408-636cf75c0c4a" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_069e8bb8-bc69-4d56-a77d-ffb25d6361da" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnamortizedDebtIssuanceExpense_fb3e0672-6dc0-4924-b129-38fea00b2df3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_UnamortizedDebtIssuanceExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtByCurrentAndNoncurrentAbstract_d4a2d756-57bd-46ea-8408-636cf75c0c4a" xlink:to="loc_us-gaap_UnamortizedDebtIssuanceExpense_fb3e0672-6dc0-4924-b129-38fea00b2df3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_320e2cad-e397-4b7a-a282-76fb2a60ee10" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtLongtermAndShorttermCombinedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtByCurrentAndNoncurrentAbstract_d4a2d756-57bd-46ea-8408-636cf75c0c4a" xlink:to="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_320e2cad-e397-4b7a-a282-76fb2a60ee10" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtCurrent_a38c0152-a0bb-4744-9222-af05695f29db" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtByCurrentAndNoncurrentAbstract_d4a2d756-57bd-46ea-8408-636cf75c0c4a" xlink:to="loc_us-gaap_DebtCurrent_a38c0152-a0bb-4744-9222-af05695f29db" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_74475556-12a8-4c99-9082-b88951128eb8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtByCurrentAndNoncurrentAbstract_d4a2d756-57bd-46ea-8408-636cf75c0c4a" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_74475556-12a8-4c99-9082-b88951128eb8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_f140d9e9-4d29-44d9-b6dc-21a30a77990f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtByCurrentAndNoncurrentAbstract_d4a2d756-57bd-46ea-8408-636cf75c0c4a" xlink:to="loc_us-gaap_LongTermDebtFairValue_f140d9e9-4d29-44d9-b6dc-21a30a77990f" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/CreditFacilitiesandDebtTextualsDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#CreditFacilitiesandDebtTextualsDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/CreditFacilitiesandDebtTextualsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_0a699317-fe76-4835-8b33-88d66117f1bc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_cea763b9-cd8c-4ae9-b6d8-40d79e006e14" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0a699317-fe76-4835-8b33-88d66117f1bc" xlink:to="loc_us-gaap_DebtInstrumentTable_cea763b9-cd8c-4ae9-b6d8-40d79e006e14" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_f0609a07-67d2-4765-8360-9b6214bd36de" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_cea763b9-cd8c-4ae9-b6d8-40d79e006e14" xlink:to="loc_us-gaap_DebtInstrumentAxis_f0609a07-67d2-4765-8360-9b6214bd36de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_f0609a07-67d2-4765-8360-9b6214bd36de_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_f0609a07-67d2-4765-8360-9b6214bd36de" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_f0609a07-67d2-4765-8360-9b6214bd36de_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_8ed9c957-101f-4c02-a5a0-978b2789d766" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_f0609a07-67d2-4765-8360-9b6214bd36de" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_8ed9c957-101f-4c02-a5a0-978b2789d766" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_SeniorNotesDueTwentyTwentyEightMember_d35d84c0-c6f7-4818-93d6-21f3f6f5a2e7" xlink:href="xyl-20240930.xsd#xyl_SeniorNotesDueTwentyTwentyEightMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_8ed9c957-101f-4c02-a5a0-978b2789d766" xlink:to="loc_xyl_SeniorNotesDueTwentyTwentyEightMember_d35d84c0-c6f7-4818-93d6-21f3f6f5a2e7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_SeniorNotesDueTwentyThirtyOneMember_d24ea02c-150a-44ed-ad3f-8939c7205186" xlink:href="xyl-20240930.xsd#xyl_SeniorNotesDueTwentyThirtyOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_8ed9c957-101f-4c02-a5a0-978b2789d766" xlink:to="loc_xyl_SeniorNotesDueTwentyThirtyOneMember_d24ea02c-150a-44ed-ad3f-8939c7205186" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_GreenBondMember_d5482d5e-f691-482a-a147-3dabb1c51c65" xlink:href="xyl-20240930.xsd#xyl_GreenBondMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_8ed9c957-101f-4c02-a5a0-978b2789d766" xlink:to="loc_xyl_GreenBondMember_d5482d5e-f691-482a-a147-3dabb1c51c65" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_SeniorNotesDueTwoThousandTwentySixMember_38b7fb76-7e0f-4824-bf3f-33c65ee8da93" xlink:href="xyl-20240930.xsd#xyl_SeniorNotesDueTwoThousandTwentySixMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_8ed9c957-101f-4c02-a5a0-978b2789d766" xlink:to="loc_xyl_SeniorNotesDueTwoThousandTwentySixMember_38b7fb76-7e0f-4824-bf3f-33c65ee8da93" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_SeniorNotesDueTwoThousandFortySixMember_d8f39063-d38a-41f3-820f-a6a7cb0c9d99" xlink:href="xyl-20240930.xsd#xyl_SeniorNotesDueTwoThousandFortySixMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_8ed9c957-101f-4c02-a5a0-978b2789d766" xlink:to="loc_xyl_SeniorNotesDueTwoThousandFortySixMember_d8f39063-d38a-41f3-820f-a6a7cb0c9d99" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_FiveYearRevolvingCreditFacility2019Member_e068ff7b-1bb3-4322-a444-7e06599658d1" xlink:href="xyl-20240930.xsd#xyl_FiveYearRevolvingCreditFacility2019Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_8ed9c957-101f-4c02-a5a0-978b2789d766" xlink:to="loc_xyl_FiveYearRevolvingCreditFacility2019Member_e068ff7b-1bb3-4322-a444-7e06599658d1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_FiveYearRevolvingCreditFacility2023Member_e9b8db78-8045-4753-9e15-f9c02cc942d8" xlink:href="xyl-20240930.xsd#xyl_FiveYearRevolvingCreditFacility2023Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_8ed9c957-101f-4c02-a5a0-978b2789d766" xlink:to="loc_xyl_FiveYearRevolvingCreditFacility2023Member_e9b8db78-8045-4753-9e15-f9c02cc942d8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_INGBankTermLoanFacilityMember_519b06b4-3161-4d47-96d2-8732d36b0011" xlink:href="xyl-20240930.xsd#xyl_INGBankTermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_8ed9c957-101f-4c02-a5a0-978b2789d766" xlink:to="loc_xyl_INGBankTermLoanFacilityMember_519b06b4-3161-4d47-96d2-8732d36b0011" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_USDollarCommercialPaperProgramMember_bb185843-9ef3-42a8-95a2-9e1d9a82fbe1" xlink:href="xyl-20240930.xsd#xyl_USDollarCommercialPaperProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_8ed9c957-101f-4c02-a5a0-978b2789d766" xlink:to="loc_xyl_USDollarCommercialPaperProgramMember_bb185843-9ef3-42a8-95a2-9e1d9a82fbe1" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_EuroCommercialPaperProgramMember_2e7e077e-e91f-4686-b9ef-738fa17a3099" xlink:href="xyl-20240930.xsd#xyl_EuroCommercialPaperProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_8ed9c957-101f-4c02-a5a0-978b2789d766" xlink:to="loc_xyl_EuroCommercialPaperProgramMember_2e7e077e-e91f-4686-b9ef-738fa17a3099" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_da962b6c-7335-417e-835b-18e8808245dc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_cea763b9-cd8c-4ae9-b6d8-40d79e006e14" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_da962b6c-7335-417e-835b-18e8808245dc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_da962b6c-7335-417e-835b-18e8808245dc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_da962b6c-7335-417e-835b-18e8808245dc" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_da962b6c-7335-417e-835b-18e8808245dc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_33697c6a-99c2-48c8-aa13-182bfbbde486" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_da962b6c-7335-417e-835b-18e8808245dc" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_33697c6a-99c2-48c8-aa13-182bfbbde486" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_6302b5ee-c92b-4bc2-a400-590b12d46fbd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_33697c6a-99c2-48c8-aa13-182bfbbde486" xlink:to="loc_us-gaap_SeniorNotesMember_6302b5ee-c92b-4bc2-a400-590b12d46fbd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_aee458b2-fc65-4a5e-b0be-de54835e8119" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_33697c6a-99c2-48c8-aa13-182bfbbde486" xlink:to="loc_us-gaap_LineOfCreditMember_aee458b2-fc65-4a5e-b0be-de54835e8119" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_bd7c33f2-ddbb-4ac4-b98a-249272a529bf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_33697c6a-99c2-48c8-aa13-182bfbbde486" xlink:to="loc_us-gaap_SecuredDebtMember_bd7c33f2-ddbb-4ac4-b98a-249272a529bf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_b8bc4c1a-162a-497d-9fdd-bd5eeae17c37" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_cea763b9-cd8c-4ae9-b6d8-40d79e006e14" xlink:to="loc_us-gaap_CreditFacilityAxis_b8bc4c1a-162a-497d-9fdd-bd5eeae17c37" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_b8bc4c1a-162a-497d-9fdd-bd5eeae17c37_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_b8bc4c1a-162a-497d-9fdd-bd5eeae17c37" xlink:to="loc_us-gaap_CreditFacilityDomain_b8bc4c1a-162a-497d-9fdd-bd5eeae17c37_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_5a11925c-0991-4704-8e76-96f76f3c34e0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_b8bc4c1a-162a-497d-9fdd-bd5eeae17c37" xlink:to="loc_us-gaap_CreditFacilityDomain_5a11925c-0991-4704-8e76-96f76f3c34e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_a5178c20-5730-4298-961f-e59fafdfb175" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_5a11925c-0991-4704-8e76-96f76f3c34e0" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_a5178c20-5730-4298-961f-e59fafdfb175" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_f7e5e799-24e7-49b2-be5f-907a9028a2aa" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_cea763b9-cd8c-4ae9-b6d8-40d79e006e14" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_f7e5e799-24e7-49b2-be5f-907a9028a2aa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f7e5e799-24e7-49b2-be5f-907a9028a2aa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_f7e5e799-24e7-49b2-be5f-907a9028a2aa" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f7e5e799-24e7-49b2-be5f-907a9028a2aa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7d88c372-23c8-44aa-a054-07ba2ca2f5e1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_f7e5e799-24e7-49b2-be5f-907a9028a2aa" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7d88c372-23c8-44aa-a054-07ba2ca2f5e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_EvoquaAcquisitionMember_3e997822-3030-4202-80c8-854d8d7b2bc1" xlink:href="xyl-20240930.xsd#xyl_EvoquaAcquisitionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7d88c372-23c8-44aa-a054-07ba2ca2f5e1" xlink:to="loc_xyl_EvoquaAcquisitionMember_3e997822-3030-4202-80c8-854d8d7b2bc1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_ad918a9e-9543-4b01-a931-52749fe66cfa" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0a699317-fe76-4835-8b33-88d66117f1bc" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_ad918a9e-9543-4b01-a931-52749fe66cfa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_5d615ace-05f8-45d5-9a8a-d0a987b5a532" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0a699317-fe76-4835-8b33-88d66117f1bc" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_5d615ace-05f8-45d5-9a8a-d0a987b5a532" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_RedemptionPricePercentage_80cc3447-8897-4046-a6c9-2cf5805d5403" xlink:href="xyl-20240930.xsd#xyl_RedemptionPricePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0a699317-fe76-4835-8b33-88d66117f1bc" xlink:to="loc_xyl_RedemptionPricePercentage_80cc3447-8897-4046-a6c9-2cf5805d5403" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_6cdcba31-cbc4-4505-886a-7bad32355e73" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0a699317-fe76-4835-8b33-88d66117f1bc" xlink:to="loc_us-gaap_DebtInstrumentTerm_6cdcba31-cbc4-4505-886a-7bad32355e73" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_75f43ee6-48b9-4871-8e72-c7409eb980ea" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0a699317-fe76-4835-8b33-88d66117f1bc" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_75f43ee6-48b9-4871-8e72-c7409eb980ea" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_LineofCreditFacilityIncreasesinMaximumBorrowingCapacity_9945af9b-ad1e-4f6f-ab8d-50ff02f8bb67" xlink:href="xyl-20240930.xsd#xyl_LineofCreditFacilityIncreasesinMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0a699317-fe76-4835-8b33-88d66117f1bc" xlink:to="loc_xyl_LineofCreditFacilityIncreasesinMaximumBorrowingCapacity_9945af9b-ad1e-4f6f-ab8d-50ff02f8bb67" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_LineofCreditFacilityIncreasesinMaximumBorrowingCapacityTotal_e3eae58c-b344-4398-bfc4-6d587e872a0c" xlink:href="xyl-20240930.xsd#xyl_LineofCreditFacilityIncreasesinMaximumBorrowingCapacityTotal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0a699317-fe76-4835-8b33-88d66117f1bc" xlink:to="loc_xyl_LineofCreditFacilityIncreasesinMaximumBorrowingCapacityTotal_e3eae58c-b344-4398-bfc4-6d587e872a0c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_DebtInstrumentCovenantMaximumLeverageRatioFourConsecutiveQuartersAfterMaterialAcquisition_aaac46f4-ec42-452c-bab9-9ff7f3174de3" xlink:href="xyl-20240930.xsd#xyl_DebtInstrumentCovenantMaximumLeverageRatioFourConsecutiveQuartersAfterMaterialAcquisition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0a699317-fe76-4835-8b33-88d66117f1bc" xlink:to="loc_xyl_DebtInstrumentCovenantMaximumLeverageRatioFourConsecutiveQuartersAfterMaterialAcquisition_aaac46f4-ec42-452c-bab9-9ff7f3174de3" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_DebtInstrumentCovenantMaximumLeverageRatioFourConsecutiveQuartersBeforeAdditionalMaterialAcquisition_c4e88ad7-b029-4d0f-a975-490d6cf56086" xlink:href="xyl-20240930.xsd#xyl_DebtInstrumentCovenantMaximumLeverageRatioFourConsecutiveQuartersBeforeAdditionalMaterialAcquisition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0a699317-fe76-4835-8b33-88d66117f1bc" xlink:to="loc_xyl_DebtInstrumentCovenantMaximumLeverageRatioFourConsecutiveQuartersBeforeAdditionalMaterialAcquisition_c4e88ad7-b029-4d0f-a975-490d6cf56086" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrincipalAmountOutstandingOnLoansSecuritized_aca7fdc7-a2e6-4b6f-b673-bdf4f28049e3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PrincipalAmountOutstandingOnLoansSecuritized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0a699317-fe76-4835-8b33-88d66117f1bc" xlink:to="loc_us-gaap_PrincipalAmountOutstandingOnLoansSecuritized_aca7fdc7-a2e6-4b6f-b673-bdf4f28049e3" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_7d97de38-e238-4837-a78e-b9fad972b2ca" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0a699317-fe76-4835-8b33-88d66117f1bc" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_7d97de38-e238-4837-a78e-b9fad972b2ca" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ExtinguishmentOfDebtAmount_1b49a9f6-97f4-4930-aa36-63be0ef34d0f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ExtinguishmentOfDebtAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0a699317-fe76-4835-8b33-88d66117f1bc" xlink:to="loc_us-gaap_ExtinguishmentOfDebtAmount_1b49a9f6-97f4-4930-aa36-63be0ef34d0f" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/CreditFacilitiesandDebtDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#CreditFacilitiesandDebtDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/CreditFacilitiesandDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_28c85cd9-3b63-4895-8dfd-6ca299d4c05d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_4d945341-67ed-4899-8a65-53b4af4677df" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_28c85cd9-3b63-4895-8dfd-6ca299d4c05d" xlink:to="loc_us-gaap_DebtInstrumentTable_4d945341-67ed-4899-8a65-53b4af4677df" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_e3395710-eae3-4896-af25-ccda97885d04" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4d945341-67ed-4899-8a65-53b4af4677df" xlink:to="loc_us-gaap_DebtInstrumentAxis_e3395710-eae3-4896-af25-ccda97885d04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_e3395710-eae3-4896-af25-ccda97885d04_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_e3395710-eae3-4896-af25-ccda97885d04" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_e3395710-eae3-4896-af25-ccda97885d04_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_4617bbe0-877a-436c-be47-9d1b2b1e4856" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_e3395710-eae3-4896-af25-ccda97885d04" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_4617bbe0-877a-436c-be47-9d1b2b1e4856" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_EquipmentFinancingMember_b0f4f2c9-8af1-4825-868a-a111a5782a3e" xlink:href="xyl-20240930.xsd#xyl_EquipmentFinancingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_4617bbe0-877a-436c-be47-9d1b2b1e4856" xlink:to="loc_xyl_EquipmentFinancingMember_b0f4f2c9-8af1-4825-868a-a111a5782a3e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralAxis_f0d822e4-5e40-49a4-a81f-6103539166aa" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CollateralAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4d945341-67ed-4899-8a65-53b4af4677df" xlink:to="loc_us-gaap_CollateralAxis_f0d822e4-5e40-49a4-a81f-6103539166aa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralDomain_f0d822e4-5e40-49a4-a81f-6103539166aa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CollateralDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CollateralAxis_f0d822e4-5e40-49a4-a81f-6103539166aa" xlink:to="loc_us-gaap_CollateralDomain_f0d822e4-5e40-49a4-a81f-6103539166aa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralDomain_daf8918a-1efc-4cb2-8cd1-c71101b96a6a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CollateralDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CollateralAxis_f0d822e4-5e40-49a4-a81f-6103539166aa" xlink:to="loc_us-gaap_CollateralDomain_daf8918a-1efc-4cb2-8cd1-c71101b96a6a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetPledgedAsCollateralMember_d6558535-2b38-4545-94d7-852013363723" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AssetPledgedAsCollateralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CollateralDomain_daf8918a-1efc-4cb2-8cd1-c71101b96a6a" xlink:to="loc_us-gaap_AssetPledgedAsCollateralMember_d6558535-2b38-4545-94d7-852013363723" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_d57b8200-68aa-4d2b-a849-1ab9a3aaa1a6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4d945341-67ed-4899-8a65-53b4af4677df" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_d57b8200-68aa-4d2b-a849-1ab9a3aaa1a6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d57b8200-68aa-4d2b-a849-1ab9a3aaa1a6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_d57b8200-68aa-4d2b-a849-1ab9a3aaa1a6" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d57b8200-68aa-4d2b-a849-1ab9a3aaa1a6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_c49d5937-7106-4ddf-ad79-ea4be77c6502" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_d57b8200-68aa-4d2b-a849-1ab9a3aaa1a6" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_c49d5937-7106-4ddf-ad79-ea4be77c6502" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_EvoquaAcquisitionMember_a27f402f-6373-4b99-8a7c-109d1866a3fa" xlink:href="xyl-20240930.xsd#xyl_EvoquaAcquisitionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_c49d5937-7106-4ddf-ad79-ea4be77c6502" xlink:to="loc_xyl_EvoquaAcquisitionMember_a27f402f-6373-4b99-8a7c-109d1866a3fa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_GrossAssetsAbstract_e43b74b9-8eda-4a93-b0f8-223c5a0e67bc" xlink:href="xyl-20240930.xsd#xyl_GrossAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_28c85cd9-3b63-4895-8dfd-6ca299d4c05d" xlink:to="loc_xyl_GrossAssetsAbstract_e43b74b9-8eda-4a93-b0f8-223c5a0e67bc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_3c1dda18-c01a-4714-9ca0-d4ef785690a1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_xyl_GrossAssetsAbstract_e43b74b9-8eda-4a93-b0f8-223c5a0e67bc" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_3c1dda18-c01a-4714-9ca0-d4ef785690a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableGross_8c7e49d5-3285-4b08-a5dd-ec6224a5d427" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccountsReceivableGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_xyl_GrossAssetsAbstract_e43b74b9-8eda-4a93-b0f8-223c5a0e67bc" xlink:to="loc_us-gaap_AccountsReceivableGross_8c7e49d5-3285-4b08-a5dd-ec6224a5d427" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_d6b2bc20-8408-47cb-ad06-09ef22741267" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_xyl_GrossAssetsAbstract_e43b74b9-8eda-4a93-b0f8-223c5a0e67bc" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_d6b2bc20-8408-47cb-ad06-09ef22741267" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_OtherNoncurrentAssetsBeforeDepreciation_eb97aaba-1340-44c4-a5bf-b2f8c3c7bd88" xlink:href="xyl-20240930.xsd#xyl_OtherNoncurrentAssetsBeforeDepreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_xyl_GrossAssetsAbstract_e43b74b9-8eda-4a93-b0f8-223c5a0e67bc" xlink:to="loc_xyl_OtherNoncurrentAssetsBeforeDepreciation_eb97aaba-1340-44c4-a5bf-b2f8c3c7bd88" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_AssetsBeforeDepreciation_605d6f80-f230-4627-94c8-bb11c0dd2875" xlink:href="xyl-20240930.xsd#xyl_AssetsBeforeDepreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_xyl_GrossAssetsAbstract_e43b74b9-8eda-4a93-b0f8-223c5a0e67bc" xlink:to="loc_xyl_AssetsBeforeDepreciation_605d6f80-f230-4627-94c8-bb11c0dd2875" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_67f19873-4fb0-44f1-8044-bac375e0736d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_28c85cd9-3b63-4895-8dfd-6ca299d4c05d" xlink:to="loc_us-gaap_AssetsAbstract_67f19873-4fb0-44f1-8044-bac375e0736d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_a06e88d3-9ed5-46a7-bc21-966ef66e492b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_67f19873-4fb0-44f1-8044-bac375e0736d" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_a06e88d3-9ed5-46a7-bc21-966ef66e492b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNet_c0cc6abb-c9f3-47f9-91a3-72df63539010" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccountsReceivableNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_67f19873-4fb0-44f1-8044-bac375e0736d" xlink:to="loc_us-gaap_AccountsReceivableNet_c0cc6abb-c9f3-47f9-91a3-72df63539010" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_1e2b8b9a-6990-44b7-9594-617209520b0e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_2ae3edfc-d2df-462c-93cc-915338b7912f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_67f19873-4fb0-44f1-8044-bac375e0736d" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_2ae3edfc-d2df-462c-93cc-915338b7912f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_46849da8-9d4c-4d28-bfd1-f1b9fd4ac074" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_67f19873-4fb0-44f1-8044-bac375e0736d" xlink:to="loc_us-gaap_Assets_46849da8-9d4c-4d28-bfd1-f1b9fd4ac074" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/PostretirementBenefitPlansSummaryofNetPeriodicBenefitCostDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#PostretirementBenefitPlansSummaryofNetPeriodicBenefitCostDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/PostretirementBenefitPlansSummaryofNetPeriodicBenefitCostDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_adc20e58-2b6c-46c4-8b75-fd7eedc864e5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_3a185c3f-c4cf-4158-9126-c441a029f416" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_adc20e58-2b6c-46c4-8b75-fd7eedc864e5" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_3a185c3f-c4cf-4158-9126-c441a029f416" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_becf1f57-b05b-4848-9b7b-743246a63901" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_3a185c3f-c4cf-4158-9126-c441a029f416" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_becf1f57-b05b-4848-9b7b-743246a63901" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_becf1f57-b05b-4848-9b7b-743246a63901_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_becf1f57-b05b-4848-9b7b-743246a63901" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_becf1f57-b05b-4848-9b7b-743246a63901_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_f2ccfeb3-622e-4d2d-8206-f520d0defa99" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_becf1f57-b05b-4848-9b7b-743246a63901" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_f2ccfeb3-622e-4d2d-8206-f520d0defa99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_1a2690a3-6adf-4faf-851a-3f63087ca1fb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DomesticPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_f2ccfeb3-622e-4d2d-8206-f520d0defa99" xlink:to="loc_us-gaap_DomesticPlanMember_1a2690a3-6adf-4faf-851a-3f63087ca1fb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_3f38724b-900e-452a-98cc-9ae5370915eb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ForeignPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_f2ccfeb3-622e-4d2d-8206-f520d0defa99" xlink:to="loc_us-gaap_ForeignPlanMember_3f38724b-900e-452a-98cc-9ae5370915eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_bb58a6ac-4a5e-4f2a-bfd5-c80bb1925b15" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_adc20e58-2b6c-46c4-8b75-fd7eedc864e5" xlink:to="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_bb58a6ac-4a5e-4f2a-bfd5-c80bb1925b15" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_4a73a8bb-40df-4940-9f6b-94149ddea119" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_bb58a6ac-4a5e-4f2a-bfd5-c80bb1925b15" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_4a73a8bb-40df-4940-9f6b-94149ddea119" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_f769a9b7-259c-474e-8c32-dc9c351a7c95" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_4a73a8bb-40df-4940-9f6b-94149ddea119" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_f769a9b7-259c-474e-8c32-dc9c351a7c95" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_d85f4533-2dd5-4182-b7bc-94c8198ec26a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_4a73a8bb-40df-4940-9f6b-94149ddea119" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_d85f4533-2dd5-4182-b7bc-94c8198ec26a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_a7ad63dc-4aff-4e7d-aee9-87e34ec750c1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_4a73a8bb-40df-4940-9f6b-94149ddea119" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_a7ad63dc-4aff-4e7d-aee9-87e34ec750c1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_cfbbf5a2-c0f9-4409-8986-ed97ab648c21" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_4a73a8bb-40df-4940-9f6b-94149ddea119" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_cfbbf5a2-c0f9-4409-8986-ed97ab648c21" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_10860efc-ba50-45de-81ed-3b5762eb1bae" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_4a73a8bb-40df-4940-9f6b-94149ddea119" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_10860efc-ba50-45de-81ed-3b5762eb1bae" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/PostretirementBenefitPlansTextualsDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#PostretirementBenefitPlansTextualsDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/PostretirementBenefitPlansTextualsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_ffb375aa-6b28-46ce-bd3e-4d1811ac2e0e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_3b3c40c5-1b05-485f-b80e-aa624f4be2fc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_ffb375aa-6b28-46ce-bd3e-4d1811ac2e0e" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_3b3c40c5-1b05-485f-b80e-aa624f4be2fc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_c25d6a70-f4fc-47e1-9b76-d23022c43c95" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_3b3c40c5-1b05-485f-b80e-aa624f4be2fc" xlink:to="loc_srt_RangeAxis_c25d6a70-f4fc-47e1-9b76-d23022c43c95" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_c25d6a70-f4fc-47e1-9b76-d23022c43c95_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_c25d6a70-f4fc-47e1-9b76-d23022c43c95" xlink:to="loc_srt_RangeMember_c25d6a70-f4fc-47e1-9b76-d23022c43c95_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_160bb466-43f3-42e4-b91f-3f2d25868324" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_c25d6a70-f4fc-47e1-9b76-d23022c43c95" xlink:to="loc_srt_RangeMember_160bb466-43f3-42e4-b91f-3f2d25868324" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_b34c23a9-8870-4c91-9dc1-3daec6558e16" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_160bb466-43f3-42e4-b91f-3f2d25868324" xlink:to="loc_srt_MaximumMember_b34c23a9-8870-4c91-9dc1-3daec6558e16" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_659624cc-4fb4-45e7-9cb2-47a66017f99c" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_160bb466-43f3-42e4-b91f-3f2d25868324" xlink:to="loc_srt_MinimumMember_659624cc-4fb4-45e7-9cb2-47a66017f99c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitExpense_e364f5fc-98d5-446b-8178-c8bcbbd2f529" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherPostretirementBenefitExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_ffb375aa-6b28-46ce-bd3e-4d1811ac2e0e" xlink:to="loc_us-gaap_OtherPostretirementBenefitExpense_e364f5fc-98d5-446b-8178-c8bcbbd2f529" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_2771dfe1-2a73-4792-824e-1a65d56fc1c7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_ffb375aa-6b28-46ce-bd3e-4d1811ac2e0e" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_2771dfe1-2a73-4792-824e-1a65d56fc1c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_77000be1-a77e-4960-9c1f-aa93a56b266c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanContributionsByEmployer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_ffb375aa-6b28-46ce-bd3e-4d1811ac2e0e" xlink:to="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_77000be1-a77e-4960-9c1f-aa93a56b266c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear_5d417821-719c-4274-b542-055c08a73211" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_ffb375aa-6b28-46ce-bd3e-4d1811ac2e0e" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear_5d417821-719c-4274-b542-055c08a73211" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/EquitySummaryofShareholdersEquityDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#EquitySummaryofShareholdersEquityDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/EquitySummaryofShareholdersEquityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_b08d0a5b-3e26-445f-bee4-5145d4ddde38" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_8753274e-19c7-4122-9bd7-fb6cab2eb33c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_b08d0a5b-3e26-445f-bee4-5145d4ddde38" xlink:to="loc_us-gaap_StatementTable_8753274e-19c7-4122-9bd7-fb6cab2eb33c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_9569a585-9e6d-49db-9035-9146921cb0bf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_8753274e-19c7-4122-9bd7-fb6cab2eb33c" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_9569a585-9e6d-49db-9035-9146921cb0bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_9569a585-9e6d-49db-9035-9146921cb0bf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_9569a585-9e6d-49db-9035-9146921cb0bf" xlink:to="loc_us-gaap_EquityComponentDomain_9569a585-9e6d-49db-9035-9146921cb0bf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_4fd63041-d576-47a6-9f92-5d3526d487ff" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_9569a585-9e6d-49db-9035-9146921cb0bf" xlink:to="loc_us-gaap_EquityComponentDomain_4fd63041-d576-47a6-9f92-5d3526d487ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_859c035f-b193-47d3-9747-615b4219b865" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_4fd63041-d576-47a6-9f92-5d3526d487ff" xlink:to="loc_us-gaap_CommonStockMember_859c035f-b193-47d3-9747-615b4219b865" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_52ca30b4-ea4f-42d2-bda9-e25f5bb09fdf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_4fd63041-d576-47a6-9f92-5d3526d487ff" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_52ca30b4-ea4f-42d2-bda9-e25f5bb09fdf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_2d7d29ec-a354-43a2-b679-53ac48670491" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_4fd63041-d576-47a6-9f92-5d3526d487ff" xlink:to="loc_us-gaap_RetainedEarningsMember_2d7d29ec-a354-43a2-b679-53ac48670491" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_5c5f3c4a-f5ba-4818-8974-e7a3f7308209" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_4fd63041-d576-47a6-9f92-5d3526d487ff" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_5c5f3c4a-f5ba-4818-8974-e7a3f7308209" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_31f1b8d6-8913-406b-af92-3cd8ec6d26ac" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_4fd63041-d576-47a6-9f92-5d3526d487ff" xlink:to="loc_us-gaap_TreasuryStockCommonMember_31f1b8d6-8913-406b-af92-3cd8ec6d26ac" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_91785be3-4713-4db5-b12e-e8e8fde111ad" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_4fd63041-d576-47a6-9f92-5d3526d487ff" xlink:to="loc_us-gaap_NoncontrollingInterestMember_91785be3-4713-4db5-b12e-e8e8fde111ad" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_ae1ab0b6-d050-4c1b-8333-b6a3f38b2ef6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommonStockDividendsPerShareDeclared"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_b08d0a5b-3e26-445f-bee4-5145d4ddde38" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_ae1ab0b6-d050-4c1b-8333-b6a3f38b2ef6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_fa27ef25-9e59-48ba-b973-6412e582cd4d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_b08d0a5b-3e26-445f-bee4-5145d4ddde38" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_fa27ef25-9e59-48ba-b973-6412e582cd4d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_2b6eaf94-3f58-4b1b-bd49-1ebb2cae125a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_fa27ef25-9e59-48ba-b973-6412e582cd4d" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_2b6eaf94-3f58-4b1b-bd49-1ebb2cae125a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_e17f2a65-4064-4739-9b6f-dc1353390209" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_fa27ef25-9e59-48ba-b973-6412e582cd4d" xlink:to="loc_us-gaap_ProfitLoss_e17f2a65-4064-4739-9b6f-dc1353390209" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_6701e6ef-919b-4954-bcf9-cbe12dd95506" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_fa27ef25-9e59-48ba-b973-6412e582cd4d" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_6701e6ef-919b-4954-bcf9-cbe12dd95506" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_2c5524eb-431f-4ece-b58b-390dd386681a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_fa27ef25-9e59-48ba-b973-6412e582cd4d" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_2c5524eb-431f-4ece-b58b-390dd386681a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_046dc8c9-1ede-4613-a9aa-3989c821861d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_fa27ef25-9e59-48ba-b973-6412e582cd4d" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_046dc8c9-1ede-4613-a9aa-3989c821861d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityOther_5fa1837c-a66c-45e6-8f02-ae7b08283f77" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockholdersEquityOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_fa27ef25-9e59-48ba-b973-6412e582cd4d" xlink:to="loc_us-gaap_StockholdersEquityOther_5fa1837c-a66c-45e6-8f02-ae7b08283f77" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCash_113c2395-02bd-4445-a7ff-59875aec1616" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DividendsCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_fa27ef25-9e59-48ba-b973-6412e582cd4d" xlink:to="loc_us-gaap_DividendsCash_113c2395-02bd-4445-a7ff-59875aec1616" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_fb9f1994-c694-4109-97db-27e4cd1a219b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_fa27ef25-9e59-48ba-b973-6412e582cd4d" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_fb9f1994-c694-4109-97db-27e4cd1a219b" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_5320e40f-2872-478d-83d9-91f3ee000c66" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_fa27ef25-9e59-48ba-b973-6412e582cd4d" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_5320e40f-2872-478d-83d9-91f3ee000c66" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_AdjustmentsToAdditionalPaidInCapitalAcquisition_43ba5476-1fa0-4444-a65f-df54f6eafbb7" xlink:href="xyl-20240930.xsd#xyl_AdjustmentsToAdditionalPaidInCapitalAcquisition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_fa27ef25-9e59-48ba-b973-6412e582cd4d" xlink:to="loc_xyl_AdjustmentsToAdditionalPaidInCapitalAcquisition_43ba5476-1fa0-4444-a65f-df54f6eafbb7" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_fdd47ee4-0534-493f-9f87-393c55d6ffd9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/ShareBasedCompensationPlansTextualsDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#ShareBasedCompensationPlansTextualsDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/ShareBasedCompensationPlansTextualsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_806ef9f7-2841-474c-985f-399c0d2c5f6e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1f1ed314-a68b-48d7-9dfe-857074e87480" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_806ef9f7-2841-474c-985f-399c0d2c5f6e" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1f1ed314-a68b-48d7-9dfe-857074e87480" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_c0fd0fe0-57d2-4926-94ab-4e1b23c7b3f5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1f1ed314-a68b-48d7-9dfe-857074e87480" xlink:to="loc_us-gaap_AwardTypeAxis_c0fd0fe0-57d2-4926-94ab-4e1b23c7b3f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c0fd0fe0-57d2-4926-94ab-4e1b23c7b3f5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_c0fd0fe0-57d2-4926-94ab-4e1b23c7b3f5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c0fd0fe0-57d2-4926-94ab-4e1b23c7b3f5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bd5e860c-945b-4370-a212-399700151bbc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_c0fd0fe0-57d2-4926-94ab-4e1b23c7b3f5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bd5e860c-945b-4370-a212-399700151bbc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_33dc12fe-f558-43d0-9562-4da5eaa0ce12" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bd5e860c-945b-4370-a212-399700151bbc" xlink:to="loc_us-gaap_EmployeeStockOptionMember_33dc12fe-f558-43d0-9562-4da5eaa0ce12" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_430582a7-4b94-4825-823e-9191a442cd7f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bd5e860c-945b-4370-a212-399700151bbc" xlink:to="loc_us-gaap_RestrictedStockMember_430582a7-4b94-4825-823e-9191a442cd7f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_5e64d4ca-80dd-4f60-9e45-cf0729a47c7b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bd5e860c-945b-4370-a212-399700151bbc" xlink:to="loc_us-gaap_PerformanceSharesMember_5e64d4ca-80dd-4f60-9e45-cf0729a47c7b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_afe92848-602c-48a1-94ab-2601f1cf1f9d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_806ef9f7-2841-474c-985f-399c0d2c5f6e" xlink:to="loc_us-gaap_ShareBasedCompensation_afe92848-602c-48a1-94ab-2601f1cf1f9d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_2531b823-a689-42da-a4bc-fdd1be6e909a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_806ef9f7-2841-474c-985f-399c0d2c5f6e" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_2531b823-a689-42da-a4bc-fdd1be6e909a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_454be45a-fce3-47cc-92c7-faf5174806a8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_806ef9f7-2841-474c-985f-399c0d2c5f6e" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_454be45a-fce3-47cc-92c7-faf5174806a8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_1db4bd9b-89f0-4254-9d78-22a6439c0c9e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProceedsFromStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_806ef9f7-2841-474c-985f-399c0d2c5f6e" xlink:to="loc_us-gaap_ProceedsFromStockOptionsExercised_1db4bd9b-89f0-4254-9d78-22a6439c0c9e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_06e26a43-fd15-4255-a227-b8f98bfdd05f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_806ef9f7-2841-474c-985f-399c0d2c5f6e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_06e26a43-fd15-4255-a227-b8f98bfdd05f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_42adb8f0-50b4-4c73-bf6d-7e40e21818a6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_806ef9f7-2841-474c-985f-399c0d2c5f6e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_42adb8f0-50b4-4c73-bf6d-7e40e21818a6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_eef89e56-8bb4-4a93-8c18-9fa907d2af78" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_806ef9f7-2841-474c-985f-399c0d2c5f6e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_eef89e56-8bb4-4a93-8c18-9fa907d2af78" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/ShareBasedCompensationPlansStockOptionFairValueAssumptionsDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#ShareBasedCompensationPlansStockOptionFairValueAssumptionsDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/ShareBasedCompensationPlansStockOptionFairValueAssumptionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_17e33d17-9457-433e-9c3d-fcf419d765e1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_cd90dba0-50a1-4bce-a86a-a2020326d41d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_17e33d17-9457-433e-9c3d-fcf419d765e1" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_cd90dba0-50a1-4bce-a86a-a2020326d41d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_003d35a8-aeab-4f31-92ec-571ebe781f2c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_cd90dba0-50a1-4bce-a86a-a2020326d41d" xlink:to="loc_us-gaap_AwardTypeAxis_003d35a8-aeab-4f31-92ec-571ebe781f2c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_003d35a8-aeab-4f31-92ec-571ebe781f2c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_003d35a8-aeab-4f31-92ec-571ebe781f2c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_003d35a8-aeab-4f31-92ec-571ebe781f2c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bd98df6a-7418-46cb-97f2-837bc1332406" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_003d35a8-aeab-4f31-92ec-571ebe781f2c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bd98df6a-7418-46cb-97f2-837bc1332406" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_27f8b996-71bf-42b2-b34b-578173c3cc7a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bd98df6a-7418-46cb-97f2-837bc1332406" xlink:to="loc_us-gaap_EmployeeStockOptionMember_27f8b996-71bf-42b2-b34b-578173c3cc7a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_58dea335-1f51-42de-949f-91667ffb8d4b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_17e33d17-9457-433e-9c3d-fcf419d765e1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_58dea335-1f51-42de-949f-91667ffb8d4b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_5f57fa4c-73f9-4d38-964c-381f85ae81ca" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_17e33d17-9457-433e-9c3d-fcf419d765e1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_5f57fa4c-73f9-4d38-964c-381f85ae81ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_613de2fb-e14c-4413-873e-2be1d2ed44e0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_17e33d17-9457-433e-9c3d-fcf419d765e1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_613de2fb-e14c-4413-873e-2be1d2ed44e0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_493fef87-77da-44fd-a361-d643abf08f3d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_17e33d17-9457-433e-9c3d-fcf419d765e1" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_493fef87-77da-44fd-a361-d643abf08f3d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageFairValue_07d9ec82-7d0a-47b5-a077-703e16457af6" xlink:href="xyl-20240930.xsd#xyl_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_17e33d17-9457-433e-9c3d-fcf419d765e1" xlink:to="loc_xyl_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageFairValue_07d9ec82-7d0a-47b5-a077-703e16457af6" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/ShareBasedCompensationPlansSummaryofRestrictedStockUnitGrantsDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#ShareBasedCompensationPlansSummaryofRestrictedStockUnitGrantsDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/ShareBasedCompensationPlansSummaryofRestrictedStockUnitGrantsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_141f964c-4763-418e-9370-0600c291665e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_eee41aa7-f37a-40da-984c-488ad6aa07c9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_141f964c-4763-418e-9370-0600c291665e" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_eee41aa7-f37a-40da-984c-488ad6aa07c9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_ee35c22d-f223-4524-a756-f5609b4a707e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_eee41aa7-f37a-40da-984c-488ad6aa07c9" xlink:to="loc_us-gaap_AwardTypeAxis_ee35c22d-f223-4524-a756-f5609b4a707e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ee35c22d-f223-4524-a756-f5609b4a707e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_ee35c22d-f223-4524-a756-f5609b4a707e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ee35c22d-f223-4524-a756-f5609b4a707e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_26c24133-4eff-48da-83ce-b4bab167b29d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_ee35c22d-f223-4524-a756-f5609b4a707e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_26c24133-4eff-48da-83ce-b4bab167b29d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_39da22ad-08e9-4c0d-bb7e-1c4e73056a2d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_26c24133-4eff-48da-83ce-b4bab167b29d" xlink:to="loc_us-gaap_RestrictedStockMember_39da22ad-08e9-4c0d-bb7e-1c4e73056a2d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_f9086cf6-3110-4f4a-84fa-7ab42f76a3f2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_141f964c-4763-418e-9370-0600c291665e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_f9086cf6-3110-4f4a-84fa-7ab42f76a3f2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_91c84d4b-5371-4a93-97a7-b67f6fd3ae04" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_f9086cf6-3110-4f4a-84fa-7ab42f76a3f2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_91c84d4b-5371-4a93-97a7-b67f6fd3ae04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_93ca2310-4ac3-4cd8-be47-7b76ae0cac93" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_f9086cf6-3110-4f4a-84fa-7ab42f76a3f2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_93ca2310-4ac3-4cd8-be47-7b76ae0cac93" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_6a6b30c7-e1e8-437f-9179-5545c495c763" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_f9086cf6-3110-4f4a-84fa-7ab42f76a3f2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_6a6b30c7-e1e8-437f-9179-5545c495c763" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_2c04144d-2ab0-4b27-9b84-9094b557a3d0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_f9086cf6-3110-4f4a-84fa-7ab42f76a3f2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_2c04144d-2ab0-4b27-9b84-9094b557a3d0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_7cb3dd19-be07-4783-8153-c33e9b224e7c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_2cb2258f-9b1a-4c8a-b334-5c577a5b25f8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_141f964c-4763-418e-9370-0600c291665e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_2cb2258f-9b1a-4c8a-b334-5c577a5b25f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_30990d9f-616a-4ca3-9052-b738861a8cab" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_2cb2258f-9b1a-4c8a-b334-5c577a5b25f8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_30990d9f-616a-4ca3-9052-b738861a8cab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_8f82c95d-ea97-43d8-ab11-09b5c431e806" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_2cb2258f-9b1a-4c8a-b334-5c577a5b25f8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_8f82c95d-ea97-43d8-ab11-09b5c431e806" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_d236ba44-e4d5-473b-b359-a125a710b2ce" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_2cb2258f-9b1a-4c8a-b334-5c577a5b25f8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_d236ba44-e4d5-473b-b359-a125a710b2ce" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_ee7744d7-0ed0-4d55-a116-2109e405be97" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_2cb2258f-9b1a-4c8a-b334-5c577a5b25f8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_ee7744d7-0ed0-4d55-a116-2109e405be97" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_85053545-04bd-4cee-ac0d-a1ccf5885526" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/ShareBasedCompensationPlansShareBasedCompensationPlansSummaryofROICPerformanceShareUnitGrantsDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#ShareBasedCompensationPlansShareBasedCompensationPlansSummaryofROICPerformanceShareUnitGrantsDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/ShareBasedCompensationPlansShareBasedCompensationPlansSummaryofROICPerformanceShareUnitGrantsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_dd2d916d-a80a-4edf-89ac-f0f65bd3b99e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_fe5d2051-2c5e-4b86-b0c8-038ef807bc25" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_dd2d916d-a80a-4edf-89ac-f0f65bd3b99e" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_fe5d2051-2c5e-4b86-b0c8-038ef807bc25" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_92761cfc-8820-4e26-bd28-f7a4ad0bb811" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_fe5d2051-2c5e-4b86-b0c8-038ef807bc25" xlink:to="loc_us-gaap_PlanNameAxis_92761cfc-8820-4e26-bd28-f7a4ad0bb811" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_92761cfc-8820-4e26-bd28-f7a4ad0bb811_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_92761cfc-8820-4e26-bd28-f7a4ad0bb811" xlink:to="loc_us-gaap_PlanNameDomain_92761cfc-8820-4e26-bd28-f7a4ad0bb811_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_b5d1e276-c153-49c9-b1da-3100def5870a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_92761cfc-8820-4e26-bd28-f7a4ad0bb811" xlink:to="loc_us-gaap_PlanNameDomain_b5d1e276-c153-49c9-b1da-3100def5870a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_ReturnonInvestedCapitalPerformanceBasedSharesMember_ca9490d1-2618-466c-bb43-de2480de92bf" xlink:href="xyl-20240930.xsd#xyl_ReturnonInvestedCapitalPerformanceBasedSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_b5d1e276-c153-49c9-b1da-3100def5870a" xlink:to="loc_xyl_ReturnonInvestedCapitalPerformanceBasedSharesMember_ca9490d1-2618-466c-bb43-de2480de92bf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_5f69c20b-63ba-44f0-b495-292fd3b3e0a0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_fe5d2051-2c5e-4b86-b0c8-038ef807bc25" xlink:to="loc_us-gaap_AwardTypeAxis_5f69c20b-63ba-44f0-b495-292fd3b3e0a0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5f69c20b-63ba-44f0-b495-292fd3b3e0a0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_5f69c20b-63ba-44f0-b495-292fd3b3e0a0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5f69c20b-63ba-44f0-b495-292fd3b3e0a0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5a92ba1d-db7d-456e-8a33-614203539734" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_5f69c20b-63ba-44f0-b495-292fd3b3e0a0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5a92ba1d-db7d-456e-8a33-614203539734" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_d9988352-1685-487b-9364-1e3692ce3fe8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5a92ba1d-db7d-456e-8a33-614203539734" xlink:to="loc_us-gaap_PerformanceSharesMember_d9988352-1685-487b-9364-1e3692ce3fe8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_04f64752-c7c9-4989-95cb-697f8a56d666" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_dd2d916d-a80a-4edf-89ac-f0f65bd3b99e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_04f64752-c7c9-4989-95cb-697f8a56d666" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_343389ad-ba00-405d-92b7-499f4763e610" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_04f64752-c7c9-4989-95cb-697f8a56d666" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_343389ad-ba00-405d-92b7-499f4763e610" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_eaeaa6fc-f0ea-4b36-a591-6e5422061a27" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_04f64752-c7c9-4989-95cb-697f8a56d666" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_eaeaa6fc-f0ea-4b36-a591-6e5422061a27" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustmentsInPeriod_1e04dd0c-a460-4acb-bdb1-90d96f6c03dc" xlink:href="xyl-20240930.xsd#xyl_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustmentsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_04f64752-c7c9-4989-95cb-697f8a56d666" xlink:to="loc_xyl_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustmentsInPeriod_1e04dd0c-a460-4acb-bdb1-90d96f6c03dc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_c789a520-ce7a-4e85-80cf-c242d856fb98" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_04f64752-c7c9-4989-95cb-697f8a56d666" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_c789a520-ce7a-4e85-80cf-c242d856fb98" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_f1b54130-5863-4965-ad1d-d8171444f4e4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_04f64752-c7c9-4989-95cb-697f8a56d666" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_f1b54130-5863-4965-ad1d-d8171444f4e4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_2a06b55a-3bfe-41e1-92fd-3ce611a85926" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_f6410e15-c4ae-4171-bf4b-302d60664057" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_dd2d916d-a80a-4edf-89ac-f0f65bd3b99e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_f6410e15-c4ae-4171-bf4b-302d60664057" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_a8767b4f-9fc4-4b11-b7cb-7681d958a759" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_f6410e15-c4ae-4171-bf4b-302d60664057" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_a8767b4f-9fc4-4b11-b7cb-7681d958a759" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_9181a74f-63b1-48b8-91aa-3d91c21cff60" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_f6410e15-c4ae-4171-bf4b-302d60664057" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_9181a74f-63b1-48b8-91aa-3d91c21cff60" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustmentsInPeriodWeightedAverageGrantDateFairValue_8248e139-d7ba-4aa2-a793-b7c28d467c56" xlink:href="xyl-20240930.xsd#xyl_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustmentsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_f6410e15-c4ae-4171-bf4b-302d60664057" xlink:to="loc_xyl_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustmentsInPeriodWeightedAverageGrantDateFairValue_8248e139-d7ba-4aa2-a793-b7c28d467c56" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_43ebd016-50c6-4493-a8ba-60c7c52b063b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_f6410e15-c4ae-4171-bf4b-302d60664057" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_43ebd016-50c6-4493-a8ba-60c7c52b063b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_8e739044-591e-42de-8561-4fa41721471c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_f6410e15-c4ae-4171-bf4b-302d60664057" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_8e739044-591e-42de-8561-4fa41721471c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_793ebfcf-bfb7-460b-a2ca-1832e474996f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/ShareBasedCompensationPlansSummaryofPerformanceBasedShareGrantsDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#ShareBasedCompensationPlansSummaryofPerformanceBasedShareGrantsDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/ShareBasedCompensationPlansSummaryofPerformanceBasedShareGrantsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_068c7e53-233c-4223-8600-de0a04050647" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ab667bec-85b5-491c-8311-e6e0eeb47b87" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_068c7e53-233c-4223-8600-de0a04050647" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ab667bec-85b5-491c-8311-e6e0eeb47b87" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_086855f2-4c14-4f8d-8d04-df9ed363b797" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ab667bec-85b5-491c-8311-e6e0eeb47b87" xlink:to="loc_us-gaap_PlanNameAxis_086855f2-4c14-4f8d-8d04-df9ed363b797" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_086855f2-4c14-4f8d-8d04-df9ed363b797_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_086855f2-4c14-4f8d-8d04-df9ed363b797" xlink:to="loc_us-gaap_PlanNameDomain_086855f2-4c14-4f8d-8d04-df9ed363b797_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_14844424-e024-468c-a424-412ff26e9448" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_086855f2-4c14-4f8d-8d04-df9ed363b797" xlink:to="loc_us-gaap_PlanNameDomain_14844424-e024-468c-a424-412ff26e9448" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_TotalShareholderReturnPerformanceBasedSharesMember_ffd35aa9-7f71-48ae-a9e0-e3dd513de0eb" xlink:href="xyl-20240930.xsd#xyl_TotalShareholderReturnPerformanceBasedSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_14844424-e024-468c-a424-412ff26e9448" xlink:to="loc_xyl_TotalShareholderReturnPerformanceBasedSharesMember_ffd35aa9-7f71-48ae-a9e0-e3dd513de0eb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_b4966c76-0f1e-4d25-a8cf-44a5c0e3d0e7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ab667bec-85b5-491c-8311-e6e0eeb47b87" xlink:to="loc_us-gaap_AwardTypeAxis_b4966c76-0f1e-4d25-a8cf-44a5c0e3d0e7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b4966c76-0f1e-4d25-a8cf-44a5c0e3d0e7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_b4966c76-0f1e-4d25-a8cf-44a5c0e3d0e7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b4966c76-0f1e-4d25-a8cf-44a5c0e3d0e7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_34e6c7fe-440b-41df-9a3f-b067ca21f37a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_b4966c76-0f1e-4d25-a8cf-44a5c0e3d0e7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_34e6c7fe-440b-41df-9a3f-b067ca21f37a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_a11eb6f3-7e5e-46d9-977e-079f9bafb929" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_34e6c7fe-440b-41df-9a3f-b067ca21f37a" xlink:to="loc_us-gaap_PerformanceSharesMember_a11eb6f3-7e5e-46d9-977e-079f9bafb929" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2519a7e5-f97d-40c0-9ee6-5b7b2424f05d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_068c7e53-233c-4223-8600-de0a04050647" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2519a7e5-f97d-40c0-9ee6-5b7b2424f05d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_b6824f2f-73dc-420c-ad5e-16873d770811" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2519a7e5-f97d-40c0-9ee6-5b7b2424f05d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_b6824f2f-73dc-420c-ad5e-16873d770811" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_234503da-71bc-4408-9a5a-e1f257560a07" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2519a7e5-f97d-40c0-9ee6-5b7b2424f05d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_234503da-71bc-4408-9a5a-e1f257560a07" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustmentsInPeriod_bc0edb60-6b23-4992-8c3d-4a74b1b5e2e9" xlink:href="xyl-20240930.xsd#xyl_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustmentsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2519a7e5-f97d-40c0-9ee6-5b7b2424f05d" xlink:to="loc_xyl_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustmentsInPeriod_bc0edb60-6b23-4992-8c3d-4a74b1b5e2e9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_17b1716f-3d39-4262-bbb3-5113cdc3ac47" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2519a7e5-f97d-40c0-9ee6-5b7b2424f05d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_17b1716f-3d39-4262-bbb3-5113cdc3ac47" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_44c7cb46-8165-41ae-975b-60e3a3a5eb22" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_2519a7e5-f97d-40c0-9ee6-5b7b2424f05d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_44c7cb46-8165-41ae-975b-60e3a3a5eb22" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_e5bf2c91-1e9e-4b47-872f-406f13470dcd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_e95bb30e-a9de-4f4e-919d-9189ef9b0b4c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_068c7e53-233c-4223-8600-de0a04050647" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_e95bb30e-a9de-4f4e-919d-9189ef9b0b4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_1bd11a6b-d73d-4993-92ff-b4efc22f1f43" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_e95bb30e-a9de-4f4e-919d-9189ef9b0b4c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_1bd11a6b-d73d-4993-92ff-b4efc22f1f43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_14c2be30-efc8-471f-b4a5-7f9b6c6cb550" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_e95bb30e-a9de-4f4e-919d-9189ef9b0b4c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_14c2be30-efc8-471f-b4a5-7f9b6c6cb550" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustmentsInPeriodWeightedAverageGrantDateFairValue_0e494853-3dd3-4e37-b6c7-ec4530eaf588" xlink:href="xyl-20240930.xsd#xyl_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustmentsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_e95bb30e-a9de-4f4e-919d-9189ef9b0b4c" xlink:to="loc_xyl_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustmentsInPeriodWeightedAverageGrantDateFairValue_0e494853-3dd3-4e37-b6c7-ec4530eaf588" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_715c6a18-91c8-427e-850a-74484158160e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_e95bb30e-a9de-4f4e-919d-9189ef9b0b4c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_715c6a18-91c8-427e-850a-74484158160e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_298428b8-a01b-4763-9c86-5e7e3256b287" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_e95bb30e-a9de-4f4e-919d-9189ef9b0b4c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_298428b8-a01b-4763-9c86-5e7e3256b287" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_bb766f9a-b80f-471f-aee7-3a6e0f5cb78e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/ShareBasedCompensationPlansTSRPerformanceBasedSharesFairValueAssumptionsDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#ShareBasedCompensationPlansTSRPerformanceBasedSharesFairValueAssumptionsDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/ShareBasedCompensationPlansTSRPerformanceBasedSharesFairValueAssumptionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_aab2905d-28c2-4fbe-856c-41a1ee7edc0e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_85497f28-30e7-4769-89f0-1a1cc99a225b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_aab2905d-28c2-4fbe-856c-41a1ee7edc0e" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_85497f28-30e7-4769-89f0-1a1cc99a225b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_4f10ac6b-2ee0-46b4-838c-332b9b8b1a65" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_85497f28-30e7-4769-89f0-1a1cc99a225b" xlink:to="loc_us-gaap_PlanNameAxis_4f10ac6b-2ee0-46b4-838c-332b9b8b1a65" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_4f10ac6b-2ee0-46b4-838c-332b9b8b1a65_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_4f10ac6b-2ee0-46b4-838c-332b9b8b1a65" xlink:to="loc_us-gaap_PlanNameDomain_4f10ac6b-2ee0-46b4-838c-332b9b8b1a65_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_33066ede-7fb6-45f5-a5ce-515d2e42c9a2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_4f10ac6b-2ee0-46b4-838c-332b9b8b1a65" xlink:to="loc_us-gaap_PlanNameDomain_33066ede-7fb6-45f5-a5ce-515d2e42c9a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_TotalShareholderReturnPerformanceBasedSharesMember_c1156763-6a47-4c36-99b8-c4739c7d7a58" xlink:href="xyl-20240930.xsd#xyl_TotalShareholderReturnPerformanceBasedSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_33066ede-7fb6-45f5-a5ce-515d2e42c9a2" xlink:to="loc_xyl_TotalShareholderReturnPerformanceBasedSharesMember_c1156763-6a47-4c36-99b8-c4739c7d7a58" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_d1ffc0c0-4fcc-4077-af22-ac29970131b8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_85497f28-30e7-4769-89f0-1a1cc99a225b" xlink:to="loc_us-gaap_AwardTypeAxis_d1ffc0c0-4fcc-4077-af22-ac29970131b8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_d1ffc0c0-4fcc-4077-af22-ac29970131b8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_d1ffc0c0-4fcc-4077-af22-ac29970131b8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_d1ffc0c0-4fcc-4077-af22-ac29970131b8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_8205820d-9cef-4e71-b2fe-8b13bc5ed6b3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_d1ffc0c0-4fcc-4077-af22-ac29970131b8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_8205820d-9cef-4e71-b2fe-8b13bc5ed6b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_ed9c8dd7-2f55-4157-86d2-34147f38a88c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_8205820d-9cef-4e71-b2fe-8b13bc5ed6b3" xlink:to="loc_us-gaap_PerformanceSharesMember_ed9c8dd7-2f55-4157-86d2-34147f38a88c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_7e8ec69a-a0ca-4119-9316-3aa3ff49cba2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_aab2905d-28c2-4fbe-856c-41a1ee7edc0e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_7e8ec69a-a0ca-4119-9316-3aa3ff49cba2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_66862bbd-9326-4190-9271-1203ba03dcfe" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_aab2905d-28c2-4fbe-856c-41a1ee7edc0e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_66862bbd-9326-4190-9271-1203ba03dcfe" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/ShareBasedCompensationPlansSummaryofREVPerformanceShareUnitGrantsDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#ShareBasedCompensationPlansSummaryofREVPerformanceShareUnitGrantsDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/ShareBasedCompensationPlansSummaryofREVPerformanceShareUnitGrantsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_001af7c7-19d1-4eb5-a4ea-8463325fea0d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_5c250f52-d485-44e0-9b92-355e6296e886" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_001af7c7-19d1-4eb5-a4ea-8463325fea0d" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_5c250f52-d485-44e0-9b92-355e6296e886" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_5bf4d6e7-f6af-4cab-9018-d25ead634095" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_5c250f52-d485-44e0-9b92-355e6296e886" xlink:to="loc_us-gaap_AwardTypeAxis_5bf4d6e7-f6af-4cab-9018-d25ead634095" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5bf4d6e7-f6af-4cab-9018-d25ead634095_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_5bf4d6e7-f6af-4cab-9018-d25ead634095" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5bf4d6e7-f6af-4cab-9018-d25ead634095_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_02568ea0-b744-475f-8fa4-2cea31a06311" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_5bf4d6e7-f6af-4cab-9018-d25ead634095" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_02568ea0-b744-475f-8fa4-2cea31a06311" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_REVPerformanceSharesMember_37ebc97c-63f4-4354-8d01-ee545fe68443" xlink:href="xyl-20240930.xsd#xyl_REVPerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_02568ea0-b744-475f-8fa4-2cea31a06311" xlink:to="loc_xyl_REVPerformanceSharesMember_37ebc97c-63f4-4354-8d01-ee545fe68443" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_40183b4e-42fa-4c92-91cf-e35475337553" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_001af7c7-19d1-4eb5-a4ea-8463325fea0d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_40183b4e-42fa-4c92-91cf-e35475337553" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_f4309d62-579d-465f-97fb-575d1a6b2788" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_40183b4e-42fa-4c92-91cf-e35475337553" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_f4309d62-579d-465f-97fb-575d1a6b2788" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_932f9a05-1fae-4895-8cb3-2f4f025e253d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_40183b4e-42fa-4c92-91cf-e35475337553" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_932f9a05-1fae-4895-8cb3-2f4f025e253d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_0bf79a34-bfc5-41bb-a081-391cddf4ebfc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_40183b4e-42fa-4c92-91cf-e35475337553" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_0bf79a34-bfc5-41bb-a081-391cddf4ebfc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_5073c692-1009-4de7-8cd8-474e2d350db1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_7b33fdd0-1b52-4ec8-be75-70afb87beb3a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_001af7c7-19d1-4eb5-a4ea-8463325fea0d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_7b33fdd0-1b52-4ec8-be75-70afb87beb3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_37387207-441b-49ff-92fb-136f21aed633" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_7b33fdd0-1b52-4ec8-be75-70afb87beb3a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_37387207-441b-49ff-92fb-136f21aed633" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_819062ce-b559-4384-b6df-b592df26c3e9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_7b33fdd0-1b52-4ec8-be75-70afb87beb3a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_819062ce-b559-4384-b6df-b592df26c3e9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_bac8ac5d-1bbd-401d-9e4b-079340b70b2b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_7b33fdd0-1b52-4ec8-be75-70afb87beb3a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_bac8ac5d-1bbd-401d-9e4b-079340b70b2b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_9cf556bb-416b-40fd-9c60-9646be21e3cd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_ShareBasedCompensationArrangementByShareBasedPaymentAwardRevenuePerformanceShareUnitGrantAwardedPercentageTarget_dc95c0d2-f896-4269-bc85-7bc5dda85122" xlink:href="xyl-20240930.xsd#xyl_ShareBasedCompensationArrangementByShareBasedPaymentAwardRevenuePerformanceShareUnitGrantAwardedPercentageTarget"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_001af7c7-19d1-4eb5-a4ea-8463325fea0d" xlink:to="loc_xyl_ShareBasedCompensationArrangementByShareBasedPaymentAwardRevenuePerformanceShareUnitGrantAwardedPercentageTarget_dc95c0d2-f896-4269-bc85-7bc5dda85122" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_ShareBasedCompensationArrangementByShareBasedPaymentAwardRevenuePerformanceShareUnitGrantTermOfAdjustedROICPerformanceTarget_191480b2-f8a6-4181-92f4-42bd5ced326c" xlink:href="xyl-20240930.xsd#xyl_ShareBasedCompensationArrangementByShareBasedPaymentAwardRevenuePerformanceShareUnitGrantTermOfAdjustedROICPerformanceTarget"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_001af7c7-19d1-4eb5-a4ea-8463325fea0d" xlink:to="loc_xyl_ShareBasedCompensationArrangementByShareBasedPaymentAwardRevenuePerformanceShareUnitGrantTermOfAdjustedROICPerformanceTarget_191480b2-f8a6-4181-92f4-42bd5ced326c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_ShareBasedCompensationArrangementByShareBasedPaymentAwardRevenuePerformanceShareUnitGrantTermOfAdjustedEBITDAPerformanceTarget_fb22f6dc-63f0-4786-b057-26edb4197759" xlink:href="xyl-20240930.xsd#xyl_ShareBasedCompensationArrangementByShareBasedPaymentAwardRevenuePerformanceShareUnitGrantTermOfAdjustedEBITDAPerformanceTarget"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_001af7c7-19d1-4eb5-a4ea-8463325fea0d" xlink:to="loc_xyl_ShareBasedCompensationArrangementByShareBasedPaymentAwardRevenuePerformanceShareUnitGrantTermOfAdjustedEBITDAPerformanceTarget_fb22f6dc-63f0-4786-b057-26edb4197759" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_ShareBasedCompensationArrangementByShareBasedPaymentAwardRevenuePerformanceShareUnitGrantTermOfRevenuePerformanceTarget_4ee63ab0-2426-4cdc-9625-1da656ec42b6" xlink:href="xyl-20240930.xsd#xyl_ShareBasedCompensationArrangementByShareBasedPaymentAwardRevenuePerformanceShareUnitGrantTermOfRevenuePerformanceTarget"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_001af7c7-19d1-4eb5-a4ea-8463325fea0d" xlink:to="loc_xyl_ShareBasedCompensationArrangementByShareBasedPaymentAwardRevenuePerformanceShareUnitGrantTermOfRevenuePerformanceTarget_4ee63ab0-2426-4cdc-9625-1da656ec42b6" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/CapitalStockTextualsDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#CapitalStockTextualsDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/CapitalStockTextualsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityClassOfTreasuryStockLineItems_085c7f7e-25e0-4e1b-a104-f6467ad275bf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityClassOfTreasuryStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfTreasuryStockTable_2b8a0814-3f18-41fe-af29-6efef6b9a7ae" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ClassOfTreasuryStockTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_085c7f7e-25e0-4e1b-a104-f6467ad275bf" xlink:to="loc_us-gaap_ClassOfTreasuryStockTable_2b8a0814-3f18-41fe-af29-6efef6b9a7ae" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramAxis_418b7745-74e3-4e31-b801-89ce69751d77" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfTreasuryStockTable_2b8a0814-3f18-41fe-af29-6efef6b9a7ae" xlink:to="loc_srt_ShareRepurchaseProgramAxis_418b7745-74e3-4e31-b801-89ce69751d77" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_418b7745-74e3-4e31-b801-89ce69751d77_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ShareRepurchaseProgramAxis_418b7745-74e3-4e31-b801-89ce69751d77" xlink:to="loc_srt_ShareRepurchaseProgramDomain_418b7745-74e3-4e31-b801-89ce69751d77_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_d64a5f16-e218-4839-a30f-7093edd8a6eb" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ShareRepurchaseProgramAxis_418b7745-74e3-4e31-b801-89ce69751d77" xlink:to="loc_srt_ShareRepurchaseProgramDomain_d64a5f16-e218-4839-a30f-7093edd8a6eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_ShareRepurchasePlansMember_ab809a01-aaaa-4ab9-ba8d-e3303d652a84" xlink:href="xyl-20240930.xsd#xyl_ShareRepurchasePlansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_d64a5f16-e218-4839-a30f-7093edd8a6eb" xlink:to="loc_xyl_ShareRepurchasePlansMember_ab809a01-aaaa-4ab9-ba8d-e3303d652a84" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_TwoThousandfifteenStockRepurchaseProgramMember_b13e81e4-6686-45d2-8831-4e6e9eda8962" xlink:href="xyl-20240930.xsd#xyl_TwoThousandfifteenStockRepurchaseProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_d64a5f16-e218-4839-a30f-7093edd8a6eb" xlink:to="loc_xyl_TwoThousandfifteenStockRepurchaseProgramMember_b13e81e4-6686-45d2-8831-4e6e9eda8962" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_SettlementofEmployeeTaxWithholdingObligationsMember_64501eac-1ba0-434e-b18b-c43018a41230" xlink:href="xyl-20240930.xsd#xyl_SettlementofEmployeeTaxWithholdingObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_d64a5f16-e218-4839-a30f-7093edd8a6eb" xlink:to="loc_xyl_SettlementofEmployeeTaxWithholdingObligationsMember_64501eac-1ba0-434e-b18b-c43018a41230" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_36b55c60-c773-4f4e-9f48-02fb060189e7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_085c7f7e-25e0-4e1b-a104-f6467ad275bf" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_36b55c60-c773-4f4e-9f48-02fb060189e7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_9f8ddb80-1e59-4299-bea7-77c99d9037a3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_085c7f7e-25e0-4e1b-a104-f6467ad275bf" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_9f8ddb80-1e59-4299-bea7-77c99d9037a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_d4f13cbf-5ebe-472f-934b-9aec06d99e09" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_085c7f7e-25e0-4e1b-a104-f6467ad275bf" xlink:to="loc_srt_StockRepurchaseProgramAuthorizedAmount1_d4f13cbf-5ebe-472f-934b-9aec06d99e09" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_e37e5362-3fa9-454a-8913-e380c9d28bad" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_085c7f7e-25e0-4e1b-a104-f6467ad275bf" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_e37e5362-3fa9-454a-8913-e380c9d28bad" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/AccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#AccumulatedOtherComprehensiveIncomeLossDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/AccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_2ab3ee96-7557-4ed2-afaa-9680fe1ce3b6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_a2a9586f-9d61-4de7-b695-4ea7e2e4949b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_2ab3ee96-7557-4ed2-afaa-9680fe1ce3b6" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_a2a9586f-9d61-4de7-b695-4ea7e2e4949b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_38b007e4-ca62-4381-ad76-90fd7b177c56" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_a2a9586f-9d61-4de7-b695-4ea7e2e4949b" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_38b007e4-ca62-4381-ad76-90fd7b177c56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_38b007e4-ca62-4381-ad76-90fd7b177c56_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_38b007e4-ca62-4381-ad76-90fd7b177c56" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_38b007e4-ca62-4381-ad76-90fd7b177c56_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_8a61596f-9ab4-4895-bbdb-d51c43c4e627" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_38b007e4-ca62-4381-ad76-90fd7b177c56" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_8a61596f-9ab4-4895-bbdb-d51c43c4e627" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherExpenseMember_f279eb9e-9197-4a29-86d9-b58b6cfb1f57" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_8a61596f-9ab4-4895-bbdb-d51c43c4e627" xlink:to="loc_us-gaap_OtherExpenseMember_f279eb9e-9197-4a29-86d9-b58b6cfb1f57" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesMember_72ac2099-3bd3-486a-ab09-7038dfc13422" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_8a61596f-9ab4-4895-bbdb-d51c43c4e627" xlink:to="loc_us-gaap_SalesMember_72ac2099-3bd3-486a-ab09-7038dfc13422" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_798a05fa-3887-468a-a7b2-bc66f9cc1d67" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_8a61596f-9ab4-4895-bbdb-d51c43c4e627" xlink:to="loc_us-gaap_CostOfSalesMember_798a05fa-3887-468a-a7b2-bc66f9cc1d67" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_2aeaa8e4-34c9-4d90-bf96-d75b7972bea0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_a2a9586f-9d61-4de7-b695-4ea7e2e4949b" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_2aeaa8e4-34c9-4d90-bf96-d75b7972bea0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_2aeaa8e4-34c9-4d90-bf96-d75b7972bea0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_2aeaa8e4-34c9-4d90-bf96-d75b7972bea0" xlink:to="loc_us-gaap_EquityComponentDomain_2aeaa8e4-34c9-4d90-bf96-d75b7972bea0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_8c5f31cf-8b00-4e0a-abc2-6b70339a4db4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_2aeaa8e4-34c9-4d90-bf96-d75b7972bea0" xlink:to="loc_us-gaap_EquityComponentDomain_8c5f31cf-8b00-4e0a-abc2-6b70339a4db4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_5f90323a-d819-419b-8719-f7e084259fd9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_8c5f31cf-8b00-4e0a-abc2-6b70339a4db4" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_5f90323a-d819-419b-8719-f7e084259fd9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_70621e0b-c99e-4872-8594-8a35626dfbe8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_8c5f31cf-8b00-4e0a-abc2-6b70339a4db4" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_70621e0b-c99e-4872-8594-8a35626dfbe8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember_be9fb59d-8d56-48ce-9e67-0115a1c72577" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_8c5f31cf-8b00-4e0a-abc2-6b70339a4db4" xlink:to="loc_us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember_be9fb59d-8d56-48ce-9e67-0115a1c72577" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_88608ee7-d457-4ab0-8df9-c03d2a88556b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_8c5f31cf-8b00-4e0a-abc2-6b70339a4db4" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_88608ee7-d457-4ab0-8df9-c03d2a88556b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_AccumulatedOtherComprehensiveIncomeLossRollForward_4e6d1a1c-01db-4ea8-b911-61ab176c19f3" xlink:href="xyl-20240930.xsd#xyl_AccumulatedOtherComprehensiveIncomeLossRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_2ab3ee96-7557-4ed2-afaa-9680fe1ce3b6" xlink:to="loc_xyl_AccumulatedOtherComprehensiveIncomeLossRollForward_4e6d1a1c-01db-4ea8-b911-61ab176c19f3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_60fbad1e-8726-4d79-bbeb-70707b981086" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_xyl_AccumulatedOtherComprehensiveIncomeLossRollForward_4e6d1a1c-01db-4ea8-b911-61ab176c19f3" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_60fbad1e-8726-4d79-bbeb-70707b981086" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax_5687c8ce-5a9f-4bc1-b1fd-9319337ac00d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_xyl_AccumulatedOtherComprehensiveIncomeLossRollForward_4e6d1a1c-01db-4ea8-b911-61ab176c19f3" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax_5687c8ce-5a9f-4bc1-b1fd-9319337ac00d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax_38b27561-4b94-4cbe-a35e-0807a382af44" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_xyl_AccumulatedOtherComprehensiveIncomeLossRollForward_4e6d1a1c-01db-4ea8-b911-61ab176c19f3" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax_38b27561-4b94-4cbe-a35e-0807a382af44" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax_99af4c2a-9a2c-472f-9570-64e3f3da0a0c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_xyl_AccumulatedOtherComprehensiveIncomeLossRollForward_4e6d1a1c-01db-4ea8-b911-61ab176c19f3" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax_99af4c2a-9a2c-472f-9570-64e3f3da0a0c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_OtherComprehensiveIncomeLossDefinedBenefitPlanForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax_a21606d2-6057-4b6f-94da-112acdf329bd" xlink:href="xyl-20240930.xsd#xyl_OtherComprehensiveIncomeLossDefinedBenefitPlanForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_xyl_AccumulatedOtherComprehensiveIncomeLossRollForward_4e6d1a1c-01db-4ea8-b911-61ab176c19f3" xlink:to="loc_xyl_OtherComprehensiveIncomeLossDefinedBenefitPlanForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax_a21606d2-6057-4b6f-94da-112acdf329bd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax_7709fcad-8524-4ee0-bd7e-a39adb20fad8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_xyl_AccumulatedOtherComprehensiveIncomeLossRollForward_4e6d1a1c-01db-4ea8-b911-61ab176c19f3" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax_7709fcad-8524-4ee0-bd7e-a39adb20fad8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_OtherComprehensiveIncomeLossForeignExchangeForPensionAndNonPensionPostretirementBenefitPlansBeforeTax_231c4ad2-f405-4c82-9e46-804308757904" xlink:href="xyl-20240930.xsd#xyl_OtherComprehensiveIncomeLossForeignExchangeForPensionAndNonPensionPostretirementBenefitPlansBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_xyl_AccumulatedOtherComprehensiveIncomeLossRollForward_4e6d1a1c-01db-4ea8-b911-61ab176c19f3" xlink:to="loc_xyl_OtherComprehensiveIncomeLossForeignExchangeForPensionAndNonPensionPostretirementBenefitPlansBeforeTax_231c4ad2-f405-4c82-9e46-804308757904" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_9ac637d5-a4b8-40f8-9eeb-9c06d00ce0da" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_xyl_AccumulatedOtherComprehensiveIncomeLossRollForward_4e6d1a1c-01db-4ea8-b911-61ab176c19f3" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_9ac637d5-a4b8-40f8-9eeb-9c06d00ce0da" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax_83222006-3b11-43f6-899f-884713ec61e1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_xyl_AccumulatedOtherComprehensiveIncomeLossRollForward_4e6d1a1c-01db-4ea8-b911-61ab176c19f3" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax_83222006-3b11-43f6-899f-884713ec61e1" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax_56ad7327-9d32-4a93-8fcf-bb3326a4ca44" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_xyl_AccumulatedOtherComprehensiveIncomeLossRollForward_4e6d1a1c-01db-4ea8-b911-61ab176c19f3" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax_56ad7327-9d32-4a93-8fcf-bb3326a4ca44" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_030645a1-36b8-40e4-897f-0ed4e8b84a75" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentCostOfRevenueBeforeTax_d4b7731c-c403-4ab7-b2eb-65603e64720a" xlink:href="xyl-20240930.xsd#xyl_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentCostOfRevenueBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_2ab3ee96-7557-4ed2-afaa-9680fe1ce3b6" xlink:to="loc_xyl_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentCostOfRevenueBeforeTax_d4b7731c-c403-4ab7-b2eb-65603e64720a" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/SegmentInformationSummaryofOperationsbySegmentDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#SegmentInformationSummaryofOperationsbySegmentDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/SegmentInformationSummaryofOperationsbySegmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_7e56914d-5f2d-40a9-96a1-99f766c07258" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_849ea013-81aa-4984-adf0-ef334e598697" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7e56914d-5f2d-40a9-96a1-99f766c07258" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_849ea013-81aa-4984-adf0-ef334e598697" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_ee0fd2ca-c391-4fa5-85ce-135fcada2870" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_849ea013-81aa-4984-adf0-ef334e598697" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_ee0fd2ca-c391-4fa5-85ce-135fcada2870" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_ee0fd2ca-c391-4fa5-85ce-135fcada2870_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_ee0fd2ca-c391-4fa5-85ce-135fcada2870" xlink:to="loc_us-gaap_SegmentDomain_ee0fd2ca-c391-4fa5-85ce-135fcada2870_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_8a5e660d-4d86-4664-9bb5-dd4dcaf659ad" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_ee0fd2ca-c391-4fa5-85ce-135fcada2870" xlink:to="loc_us-gaap_SegmentDomain_8a5e660d-4d86-4664-9bb5-dd4dcaf659ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_WaterInfrastructureMember_8c28d935-b2d8-4a32-bd53-95f07e81b03d" xlink:href="xyl-20240930.xsd#xyl_WaterInfrastructureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8a5e660d-4d86-4664-9bb5-dd4dcaf659ad" xlink:to="loc_xyl_WaterInfrastructureMember_8c28d935-b2d8-4a32-bd53-95f07e81b03d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_AppliedWaterMember_a175d604-3315-4637-9931-c2b15231dd33" xlink:href="xyl-20240930.xsd#xyl_AppliedWaterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8a5e660d-4d86-4664-9bb5-dd4dcaf659ad" xlink:to="loc_xyl_AppliedWaterMember_a175d604-3315-4637-9931-c2b15231dd33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_MeasurementandControlSolutionsMember_fb805c0d-9e82-499f-b410-136a69577f66" xlink:href="xyl-20240930.xsd#xyl_MeasurementandControlSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8a5e660d-4d86-4664-9bb5-dd4dcaf659ad" xlink:to="loc_xyl_MeasurementandControlSolutionsMember_fb805c0d-9e82-499f-b410-136a69577f66" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_WaterSolutionsAndServicesSegmentMember_fbc1003b-96e1-413d-a2c3-4456c0abe159" xlink:href="xyl-20240930.xsd#xyl_WaterSolutionsAndServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_8a5e660d-4d86-4664-9bb5-dd4dcaf659ad" xlink:to="loc_xyl_WaterSolutionsAndServicesSegmentMember_fbc1003b-96e1-413d-a2c3-4456c0abe159" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_6ff3af13-178b-4a77-878f-37601fb83b5d" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_849ea013-81aa-4984-adf0-ef334e598697" xlink:to="loc_srt_ConsolidationItemsAxis_6ff3af13-178b-4a77-878f-37601fb83b5d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_6ff3af13-178b-4a77-878f-37601fb83b5d_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_6ff3af13-178b-4a77-878f-37601fb83b5d" xlink:to="loc_srt_ConsolidationItemsDomain_6ff3af13-178b-4a77-878f-37601fb83b5d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_269a04a9-3e1e-45ab-9f6d-b1db4b8be17c" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_6ff3af13-178b-4a77-878f-37601fb83b5d" xlink:to="loc_srt_ConsolidationItemsDomain_269a04a9-3e1e-45ab-9f6d-b1db4b8be17c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_7a9a8eef-7d58-4f0c-8471-9744b20c7089" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_269a04a9-3e1e-45ab-9f6d-b1db4b8be17c" xlink:to="loc_us-gaap_OperatingSegmentsMember_7a9a8eef-7d58-4f0c-8471-9744b20c7089" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MaterialReconcilingItemsMember_e0b407fb-ceb7-4b7a-bcc5-647343b38f08" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_MaterialReconcilingItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_269a04a9-3e1e-45ab-9f6d-b1db4b8be17c" xlink:to="loc_us-gaap_MaterialReconcilingItemsMember_e0b407fb-ceb7-4b7a-bcc5-647343b38f08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_71d3a887-4406-4810-962c-3bedb7362694" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_269a04a9-3e1e-45ab-9f6d-b1db4b8be17c" xlink:to="loc_us-gaap_CorporateNonSegmentMember_71d3a887-4406-4810-962c-3bedb7362694" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingDisclosureOfEntitysReportableSegmentsAbstract_4988d015-7119-4fc7-83b2-6b99df8330c5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SegmentReportingDisclosureOfEntitysReportableSegmentsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7e56914d-5f2d-40a9-96a1-99f766c07258" xlink:to="loc_us-gaap_SegmentReportingDisclosureOfEntitysReportableSegmentsAbstract_4988d015-7119-4fc7-83b2-6b99df8330c5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_b5d3ff72-bea5-41eb-9705-e7a3893aa4e7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingDisclosureOfEntitysReportableSegmentsAbstract_4988d015-7119-4fc7-83b2-6b99df8330c5" xlink:to="loc_us-gaap_Revenues_b5d3ff72-bea5-41eb-9705-e7a3893aa4e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_16c12251-cf14-4af5-925e-2d3b11162881" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingDisclosureOfEntitysReportableSegmentsAbstract_4988d015-7119-4fc7-83b2-6b99df8330c5" xlink:to="loc_us-gaap_OperatingIncomeLoss_16c12251-cf14-4af5-925e-2d3b11162881" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_dc55f38f-0c8f-4ff6-9c6b-172b202a354e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingDisclosureOfEntitysReportableSegmentsAbstract_4988d015-7119-4fc7-83b2-6b99df8330c5" xlink:to="loc_us-gaap_InterestExpense_dc55f38f-0c8f-4ff6-9c6b-172b202a354e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_01137c0e-2a65-44df-8673-768dabd5d278" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingDisclosureOfEntitysReportableSegmentsAbstract_4988d015-7119-4fc7-83b2-6b99df8330c5" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_01137c0e-2a65-44df-8673-768dabd5d278" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfBusiness_81a415cd-bdae-48f1-bdf9-201909eece58" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GainLossOnSaleOfBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingDisclosureOfEntitysReportableSegmentsAbstract_4988d015-7119-4fc7-83b2-6b99df8330c5" xlink:to="loc_us-gaap_GainLossOnSaleOfBusiness_81a415cd-bdae-48f1-bdf9-201909eece58" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_f5c97b7b-915c-4f4a-bd24-fd79ae24470a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingDisclosureOfEntitysReportableSegmentsAbstract_4988d015-7119-4fc7-83b2-6b99df8330c5" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_f5c97b7b-915c-4f4a-bd24-fd79ae24470a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_d18f553a-e616-4d1d-b1b6-37fb954e1b07" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingDisclosureOfEntitysReportableSegmentsAbstract_4988d015-7119-4fc7-83b2-6b99df8330c5" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_d18f553a-e616-4d1d-b1b6-37fb954e1b07" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireProductiveAssets_faa8d7f1-c3a0-437a-869b-6845c879f6bb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsToAcquireProductiveAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingDisclosureOfEntitysReportableSegmentsAbstract_4988d015-7119-4fc7-83b2-6b99df8330c5" xlink:to="loc_us-gaap_PaymentsToAcquireProductiveAssets_faa8d7f1-c3a0-437a-869b-6845c879f6bb" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.xyleminc.com/role/SubsequentEventsDetails" xlink:type="simple" xlink:href="xyl-20240930.xsd#SubsequentEventsDetails"/>
  <link:definitionLink xlink:role="http://www.xyleminc.com/role/SubsequentEventsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_ee7ffe9b-1f31-419e-9b23-57c7c45fa5f0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_91a2c158-8dba-495d-9219-22e06c3d49c2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_ee7ffe9b-1f31-419e-9b23-57c7c45fa5f0" xlink:to="loc_us-gaap_SubsequentEventTable_91a2c158-8dba-495d-9219-22e06c3d49c2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_90685c68-9616-4657-83b7-4fe2cdf916f4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_91a2c158-8dba-495d-9219-22e06c3d49c2" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_90685c68-9616-4657-83b7-4fe2cdf916f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_90685c68-9616-4657-83b7-4fe2cdf916f4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_90685c68-9616-4657-83b7-4fe2cdf916f4" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_90685c68-9616-4657-83b7-4fe2cdf916f4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_bed2bdef-e24c-4cbf-a9de-c5b5b5d9260c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_90685c68-9616-4657-83b7-4fe2cdf916f4" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_bed2bdef-e24c-4cbf-a9de-c5b5b5d9260c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_040c5466-82ad-4a42-af72-8bc7a06023a0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_bed2bdef-e24c-4cbf-a9de-c5b5b5d9260c" xlink:to="loc_us-gaap_SubsequentEventMember_040c5466-82ad-4a42-af72-8bc7a06023a0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_59f7e94d-cb17-4f34-ad54-4f4f47c42cd3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_91a2c158-8dba-495d-9219-22e06c3d49c2" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_59f7e94d-cb17-4f34-ad54-4f4f47c42cd3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_59f7e94d-cb17-4f34-ad54-4f4f47c42cd3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_59f7e94d-cb17-4f34-ad54-4f4f47c42cd3" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_59f7e94d-cb17-4f34-ad54-4f4f47c42cd3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_26d96df7-aad9-41b9-81b4-2de618eb8bac" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_59f7e94d-cb17-4f34-ad54-4f4f47c42cd3" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_26d96df7-aad9-41b9-81b4-2de618eb8bac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_GlobalOmniumIdricaSLMember_d1c3d2cf-0596-4fb2-a636-dfa491dbc0b8" xlink:href="xyl-20240930.xsd#xyl_GlobalOmniumIdricaSLMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_26d96df7-aad9-41b9-81b4-2de618eb8bac" xlink:to="loc_xyl_GlobalOmniumIdricaSLMember_d1c3d2cf-0596-4fb2-a636-dfa491dbc0b8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_f3188bc3-0edd-4be4-911e-c41023b6efa7" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_91a2c158-8dba-495d-9219-22e06c3d49c2" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_f3188bc3-0edd-4be4-911e-c41023b6efa7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_f3188bc3-0edd-4be4-911e-c41023b6efa7_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_f3188bc3-0edd-4be4-911e-c41023b6efa7" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_f3188bc3-0edd-4be4-911e-c41023b6efa7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_0990e849-d791-4437-abfc-999770851183" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_f3188bc3-0edd-4be4-911e-c41023b6efa7" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_0990e849-d791-4437-abfc-999770851183" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_GlobalOmniumIdricaSLMember_6257686d-b7f6-4e06-bddf-48f2dc429891" xlink:href="xyl-20240930.xsd#xyl_GlobalOmniumIdricaSLMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_0990e849-d791-4437-abfc-999770851183" xlink:to="loc_xyl_GlobalOmniumIdricaSLMember_6257686d-b7f6-4e06-bddf-48f2dc429891" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_77dbcca7-2f1e-4bb0-8ca4-f1e44c9d338c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_ee7ffe9b-1f31-419e-9b23-57c7c45fa5f0" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_77dbcca7-2f1e-4bb0-8ca4-f1e44c9d338c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_0238b62a-674b-449e-959d-722a47c8141a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_ee7ffe9b-1f31-419e-9b23-57c7c45fa5f0" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_0238b62a-674b-449e-959d-722a47c8141a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationPriceOfAcquisitionExpected_525cf65f-c36f-44ae-ba7a-3d3fc0ee6ea2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationPriceOfAcquisitionExpected"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_ee7ffe9b-1f31-419e-9b23-57c7c45fa5f0" xlink:to="loc_us-gaap_BusinessCombinationPriceOfAcquisitionExpected_525cf65f-c36f-44ae-ba7a-3d3fc0ee6ea2" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/AwardTypeOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2024/ecd-2024.xsd#AwardTypeOnly"/>
  <link:definitionLink xlink:role="http://xbrl.sec.gov/ecd/AwardTypeOnly" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaap_RestrictedStockMember" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaap_PerformanceSharesMember" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_xyl_REVPerformanceSharesMember_18117b40-c21e-4678-8bb1-9ecd56239a6f" xlink:href="xyl-20240930.xsd#xyl_REVPerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_xyl_REVPerformanceSharesMember_18117b40-c21e-4678-8bb1-9ecd56239a6f" xlink:type="arc" order="5"/>
  </link:definitionLink>
</link:linkbase>
