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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019c96ab-902d-77ba-98e6-e00c0abf63e2,g:32639434-949f-4126-9168-200c97232bfb-->
<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.holcim.com/role/CondensedConsolidatedStatementsofEquityUnaudited" xlink:type="simple" xlink:href="holcim-20260331.xsd#CondensedConsolidatedStatementsofEquityUnaudited"/>
  <link:definitionLink xlink:role="http://www.holcim.com/role/CondensedConsolidatedStatementsofEquityUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019c96ab-929d-7f6b-a517-bfc537203adf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019c96ab-929d-74a2-8276-cf9973c3a41d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019c96ab-929d-7f6b-a517-bfc537203adf" xlink:to="loc_us-gaap_StatementTable_019c96ab-929d-74a2-8276-cf9973c3a41d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019c96ab-929d-736e-970e-eb2d7dfb90bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c96ab-929d-74a2-8276-cf9973c3a41d" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019c96ab-929d-736e-970e-eb2d7dfb90bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c96ab-929d-736e-970e-eb2d7dfb90bc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c96ab-929d-736e-970e-eb2d7dfb90bc" xlink:to="loc_us-gaap_EquityComponentDomain_019c96ab-929d-736e-970e-eb2d7dfb90bc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c96ab-929d-7432-9016-0d71423ee1fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c96ab-929d-736e-970e-eb2d7dfb90bc" xlink:to="loc_us-gaap_EquityComponentDomain_019c96ab-929d-7432-9016-0d71423ee1fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019c96ab-929d-7fcf-af3f-ee9bfdff946c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c96ab-929d-7432-9016-0d71423ee1fb" xlink:to="loc_us-gaap_CommonStockMember_019c96ab-929d-7fcf-af3f-ee9bfdff946c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_019c96ab-929d-7ee3-a110-dbd1a7ec1dff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c96ab-929d-7432-9016-0d71423ee1fb" xlink:to="loc_us-gaap_TreasuryStockCommonMember_019c96ab-929d-7ee3-a110-dbd1a7ec1dff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019c96ab-929d-7283-9e1a-2850d2097537" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c96ab-929d-7432-9016-0d71423ee1fb" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019c96ab-929d-7283-9e1a-2850d2097537" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019c96ab-929d-7779-9f81-9d24702b2c7a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c96ab-929d-7432-9016-0d71423ee1fb" xlink:to="loc_us-gaap_RetainedEarningsMember_019c96ab-929d-7779-9f81-9d24702b2c7a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_RetainedEarningsExcludingNetParentInvestmentMember_019c96ab-929d-7995-9a35-b4f9298d92f1" xlink:href="holcim-20260331.xsd#holcim_RetainedEarningsExcludingNetParentInvestmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetainedEarningsMember_019c96ab-929d-7779-9f81-9d24702b2c7a" xlink:to="loc_holcim_RetainedEarningsExcludingNetParentInvestmentMember_019c96ab-929d-7995-9a35-b4f9298d92f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_NetParentInvestmentMember_019c96ab-929d-7e13-bf97-6d02a01dea33" xlink:href="holcim-20260331.xsd#holcim_NetParentInvestmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetainedEarningsMember_019c96ab-929d-7779-9f81-9d24702b2c7a" xlink:to="loc_holcim_NetParentInvestmentMember_019c96ab-929d-7e13-bf97-6d02a01dea33" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c96ab-929d-74ee-95df-515de0c751bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c96ab-929d-7432-9016-0d71423ee1fb" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c96ab-929d-74ee-95df-515de0c751bf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_019c96ab-929d-710e-bf7a-797170f6f9f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c96ab-929d-7432-9016-0d71423ee1fb" xlink:to="loc_us-gaap_NoncontrollingInterestMember_019c96ab-929d-710e-bf7a-797170f6f9f9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c96ab-929d-7c00-805d-21e831811a81" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c96ab-929d-7f6b-a517-bfc537203adf" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c96ab-929d-7c00-805d-21e831811a81" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019c96ab-929d-72de-b594-df725ca70213" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c96ab-929d-7c00-805d-21e831811a81" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019c96ab-929d-72de-b594-df725ca70213" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c96ab-929d-7c46-b8f0-1ab8fa4d51a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c96ab-929d-7c00-805d-21e831811a81" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c96ab-929d-7c46-b8f0-1ab8fa4d51a9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_019c96ab-929d-70b9-bc67-dea8e5877327" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c96ab-929d-7c00-805d-21e831811a81" xlink:to="loc_us-gaap_TreasuryStockCommonShares_019c96ab-929d-70b9-bc67-dea8e5877327" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019c96ab-929d-7a98-8ac8-cfc828871bb8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c96ab-929d-7c00-805d-21e831811a81" xlink:to="loc_us-gaap_ProfitLoss_019c96ab-929d-7a98-8ac8-cfc828871bb8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019c96ab-929d-71af-877b-b83fdd07d6a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c96ab-929d-7c00-805d-21e831811a81" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019c96ab-929d-71af-877b-b83fdd07d6a7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019c96ab-929d-7f53-bc10-ba92aba4bf87" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c96ab-929d-7c00-805d-21e831811a81" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019c96ab-929d-7f53-bc10-ba92aba4bf87" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_019dacf5-f49f-7111-8f12-f22665411a7f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c96ab-929d-7c00-805d-21e831811a81" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_019dacf5-f49f-7111-8f12-f22665411a7f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_NetTransfersToParent_019c96ab-929d-7905-9c27-ec3251184e44" xlink:href="holcim-20260331.xsd#holcim_NetTransfersToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c96ab-929d-7c00-805d-21e831811a81" xlink:to="loc_holcim_NetTransfersToParent_019c96ab-929d-7905-9c27-ec3251184e44" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_DecreaseInNetParentInvestmentAttributableToNoncontrollingInterest_019c96ab-929d-7439-ac17-72bcbe184cd0" xlink:href="holcim-20260331.xsd#holcim_DecreaseInNetParentInvestmentAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c96ab-929d-7c00-805d-21e831811a81" xlink:to="loc_holcim_DecreaseInNetParentInvestmentAttributableToNoncontrollingInterest_019c96ab-929d-7439-ac17-72bcbe184cd0" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_019c96ab-929d-798f-a0bd-29a388cc1f06" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019c96ab-929d-7aea-b353-4c8c0263b39b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c96ab-929d-7d73-8b49-bd243656aadc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.holcim.com/role/OrganizationandbasisofpresentationNarrativeDetails" xlink:type="simple" xlink:href="holcim-20260331.xsd#OrganizationandbasisofpresentationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.holcim.com/role/OrganizationandbasisofpresentationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019c96ab-9346-74df-94b8-cb261e019eb4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c96ab-929d-7eed-a669-2f16d012604d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c96ab-9346-74df-94b8-cb261e019eb4" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c96ab-929d-7eed-a669-2f16d012604d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019c96ab-929d-7523-873d-8c8a6fd230cb" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c96ab-929d-7eed-a669-2f16d012604d" xlink:to="loc_dei_LegalEntityAxis_019c96ab-929d-7523-873d-8c8a6fd230cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c96ab-929d-7523-873d-8c8a6fd230cb_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019c96ab-929d-7523-873d-8c8a6fd230cb" xlink:to="loc_dei_EntityDomain_019c96ab-929d-7523-873d-8c8a6fd230cb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019c96ab-929d-7803-99ee-c61674e5a58b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019c96ab-929d-7523-873d-8c8a6fd230cb" xlink:to="loc_dei_EntityDomain_019c96ab-929d-7803-99ee-c61674e5a58b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_HolcimLtdMember_019c96ab-929d-799e-b0a3-c9ea2dc27bfb" xlink:href="holcim-20260331.xsd#holcim_HolcimLtdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019c96ab-929d-7803-99ee-c61674e5a58b" xlink:to="loc_holcim_HolcimLtdMember_019c96ab-929d-799e-b0a3-c9ea2dc27bfb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019c96ab-929d-71c4-b116-becfdf7ee332" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c96ab-929d-7eed-a669-2f16d012604d" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019c96ab-929d-71c4-b116-becfdf7ee332" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019c96ab-929d-71c4-b116-becfdf7ee332_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019c96ab-929d-71c4-b116-becfdf7ee332" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019c96ab-929d-71c4-b116-becfdf7ee332_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019c96ab-929d-7d9e-9ad7-bf48161ac245" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019c96ab-929d-71c4-b116-becfdf7ee332" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019c96ab-929d-7d9e-9ad7-bf48161ac245" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_AmrizeLtdMember_019c96ab-9346-72f0-bedb-aba7c7b00465" xlink:href="holcim-20260331.xsd#holcim_AmrizeLtdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019c96ab-929d-7d9e-9ad7-bf48161ac245" xlink:to="loc_holcim_AmrizeLtdMember_019c96ab-9346-72f0-bedb-aba7c7b00465" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_019c96ab-9346-79f5-a7e8-cf98978ef282" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c96ab-929d-7eed-a669-2f16d012604d" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_019c96ab-9346-79f5-a7e8-cf98978ef282" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019c96ab-9346-79f5-a7e8-cf98978ef282_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_019c96ab-9346-79f5-a7e8-cf98978ef282" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019c96ab-9346-79f5-a7e8-cf98978ef282_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019c96ab-9346-7053-a3ed-02273d6399dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_019c96ab-9346-79f5-a7e8-cf98978ef282" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019c96ab-9346-7053-a3ed-02273d6399dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationsDisposedOfByMeansOtherThanSaleSpinoffMember_019c96ab-9346-78d5-83cb-d882b7456933" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DiscontinuedOperationsDisposedOfByMeansOtherThanSaleSpinoffMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_019c96ab-9346-7053-a3ed-02273d6399dc" xlink:to="loc_us-gaap_DiscontinuedOperationsDisposedOfByMeansOtherThanSaleSpinoffMember_019c96ab-9346-78d5-83cb-d882b7456933" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c96ab-9346-7f34-a238-87438712f4c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c96ab-929d-7eed-a669-2f16d012604d" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c96ab-9346-7f34-a238-87438712f4c5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c96ab-9346-7f34-a238-87438712f4c5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c96ab-9346-7f34-a238-87438712f4c5" xlink:to="loc_us-gaap_RelatedPartyDomain_019c96ab-9346-7f34-a238-87438712f4c5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c96ab-9346-7ac6-96cd-5f33334e0e33" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c96ab-9346-7f34-a238-87438712f4c5" xlink:to="loc_us-gaap_RelatedPartyDomain_019c96ab-9346-7ac6-96cd-5f33334e0e33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019c96ab-9346-7a69-9ba3-eccb41705e94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c96ab-9346-7ac6-96cd-5f33334e0e33" xlink:to="loc_us-gaap_RelatedPartyMember_019c96ab-9346-7a69-9ba3-eccb41705e94" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_019c96ab-9346-7093-b239-5d900ae5bd70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c96ab-9346-74df-94b8-cb261e019eb4" xlink:to="loc_us-gaap_NumberOfReportableSegments_019c96ab-9346-7093-b239-5d900ae5bd70" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_DisposalGroupIncludingDiscontinuedOperationEquityInterestDisposedPercentage_019c96ab-9346-7307-956b-83b7551f1da1" xlink:href="holcim-20260331.xsd#holcim_DisposalGroupIncludingDiscontinuedOperationEquityInterestDisposedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c96ab-9346-74df-94b8-cb261e019eb4" xlink:to="loc_holcim_DisposalGroupIncludingDiscontinuedOperationEquityInterestDisposedPercentage_019c96ab-9346-7307-956b-83b7551f1da1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_DisposalGroupIncludingDiscontinuedOperationEquityInterestIssuedNumberOfShares_019c96ab-9346-77b5-9f8a-af23671f44a4" xlink:href="holcim-20260331.xsd#holcim_DisposalGroupIncludingDiscontinuedOperationEquityInterestIssuedNumberOfShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c96ab-9346-74df-94b8-cb261e019eb4" xlink:to="loc_holcim_DisposalGroupIncludingDiscontinuedOperationEquityInterestIssuedNumberOfShares_019c96ab-9346-77b5-9f8a-af23671f44a4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019c96ab-9346-77d2-ae3e-a58adbba70e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c96ab-9346-74df-94b8-cb261e019eb4" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019c96ab-9346-77d2-ae3e-a58adbba70e6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_019c96ab-9346-72ee-ad80-61fedb13fe21" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c96ab-9346-74df-94b8-cb261e019eb4" xlink:to="loc_us-gaap_TreasuryStockCommonShares_019c96ab-9346-72ee-ad80-61fedb13fe21" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_SpinOffTransactionCosts_019c96ab-9346-74ea-8c0a-ba09795ea9da" xlink:href="holcim-20260331.xsd#holcim_SpinOffTransactionCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c96ab-9346-74df-94b8-cb261e019eb4" xlink:to="loc_holcim_SpinOffTransactionCosts_019c96ab-9346-74ea-8c0a-ba09795ea9da" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.holcim.com/role/RevenuesScheduleofRevenuebyProductLineDetails" xlink:type="simple" xlink:href="holcim-20260331.xsd#RevenuesScheduleofRevenuebyProductLineDetails"/>
  <link:definitionLink xlink:role="http://www.holcim.com/role/RevenuesScheduleofRevenuebyProductLineDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019c96ab-9346-7bc0-ab67-7d84538b00aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019c96ab-9346-7b6c-a1de-847f48fa5747" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c96ab-9346-7bc0-ab67-7d84538b00aa" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019c96ab-9346-7b6c-a1de-847f48fa5747" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c96ab-9346-7377-a7ea-58e654464a96" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019c96ab-9346-7b6c-a1de-847f48fa5747" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c96ab-9346-7377-a7ea-58e654464a96" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c96ab-9346-7377-a7ea-58e654464a96_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c96ab-9346-7377-a7ea-58e654464a96" xlink:to="loc_us-gaap_SegmentDomain_019c96ab-9346-7377-a7ea-58e654464a96_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c96ab-9346-7311-8141-986cf424ef1e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c96ab-9346-7377-a7ea-58e654464a96" xlink:to="loc_us-gaap_SegmentDomain_019c96ab-9346-7311-8141-986cf424ef1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_BuildingMaterialsMember_019c96ab-9346-7250-9e91-84fa1dfd61cd" xlink:href="holcim-20260331.xsd#holcim_BuildingMaterialsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c96ab-9346-7311-8141-986cf424ef1e" xlink:to="loc_holcim_BuildingMaterialsMember_019c96ab-9346-7250-9e91-84fa1dfd61cd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_BuildingEnvelopeMember_019c96ab-9346-71ac-9827-1dca992c16ba" xlink:href="holcim-20260331.xsd#holcim_BuildingEnvelopeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c96ab-9346-7311-8141-986cf424ef1e" xlink:to="loc_holcim_BuildingEnvelopeMember_019c96ab-9346-71ac-9827-1dca992c16ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019c96ab-9346-7bf2-ace4-87840792c065" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019c96ab-9346-7b6c-a1de-847f48fa5747" xlink:to="loc_srt_ProductOrServiceAxis_019c96ab-9346-7bf2-ace4-87840792c065" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c96ab-9346-7bf2-ace4-87840792c065_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019c96ab-9346-7bf2-ace4-87840792c065" xlink:to="loc_srt_ProductsAndServicesDomain_019c96ab-9346-7bf2-ace4-87840792c065_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c96ab-9346-7951-b6e4-13c16d7231d9" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019c96ab-9346-7bf2-ace4-87840792c065" xlink:to="loc_srt_ProductsAndServicesDomain_019c96ab-9346-7951-b6e4-13c16d7231d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_CementMember_019c96ab-9346-7695-bf34-4fcb667e21fe" xlink:href="holcim-20260331.xsd#holcim_CementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c96ab-9346-7951-b6e4-13c16d7231d9" xlink:to="loc_holcim_CementMember_019c96ab-9346-7695-bf34-4fcb667e21fe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_AggregatesAndOtherConstructionMaterialsMember_019c96ab-9346-789b-ac59-fd72d26cdbfa" xlink:href="holcim-20260331.xsd#holcim_AggregatesAndOtherConstructionMaterialsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c96ab-9346-7951-b6e4-13c16d7231d9" xlink:to="loc_holcim_AggregatesAndOtherConstructionMaterialsMember_019c96ab-9346-789b-ac59-fd72d26cdbfa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_InterproductRevenuesMember_019c96ab-9346-75b8-8c58-2a0b032f9cbd" xlink:href="holcim-20260331.xsd#holcim_InterproductRevenuesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c96ab-9346-7951-b6e4-13c16d7231d9" xlink:to="loc_holcim_InterproductRevenuesMember_019c96ab-9346-75b8-8c58-2a0b032f9cbd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019c96ab-9346-7164-9a62-0cc481d947dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c96ab-9346-7bc0-ab67-7d84538b00aa" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019c96ab-9346-7164-9a62-0cc481d947dc" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.holcim.com/role/RevenuesNarrativeDetails" xlink:type="simple" xlink:href="holcim-20260331.xsd#RevenuesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.holcim.com/role/RevenuesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019c96ab-9346-7730-94cf-71c5eadddc72" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019c96ab-9346-7b9a-9d1d-376edb4d15e1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c96ab-9346-7730-94cf-71c5eadddc72" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019c96ab-9346-7b9a-9d1d-376edb4d15e1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019c96ab-9346-7ebf-aaa6-ea452814daea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019c96ab-9346-7b9a-9d1d-376edb4d15e1" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019c96ab-9346-7ebf-aaa6-ea452814daea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetNetCurrent_019c96ab-9346-7809-8735-c008c55c0f3e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerAssetNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c96ab-9346-7730-94cf-71c5eadddc72" xlink:to="loc_us-gaap_ContractWithCustomerAssetNetCurrent_019c96ab-9346-7809-8735-c008c55c0f3e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetNetNoncurrent_019c96ab-9346-7ed7-836b-ef53f2021f71" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerAssetNetNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c96ab-9346-7730-94cf-71c5eadddc72" xlink:to="loc_us-gaap_ContractWithCustomerAssetNetNoncurrent_019c96ab-9346-7ed7-836b-ef53f2021f71" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_019dad09-8e40-79e1-b8d0-058f947a854c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c96ab-9346-7730-94cf-71c5eadddc72" xlink:to="loc_us-gaap_ContractWithCustomerLiability_019dad09-8e40-79e1-b8d0-058f947a854c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019c96ab-9346-7177-94d7-c8c3b7b61107" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c96ab-9346-7730-94cf-71c5eadddc72" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019c96ab-9346-7177-94d7-c8c3b7b61107" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019c96ab-9346-7512-9d66-ba72dac12e20" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c96ab-9346-7730-94cf-71c5eadddc72" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019c96ab-9346-7512-9d66-ba72dac12e20" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.holcim.com/role/RevenuesNarrativeDetails_1" xlink:type="simple" xlink:href="holcim-20260331.xsd#RevenuesNarrativeDetails_1"/>
  <link:definitionLink xlink:role="http://www.holcim.com/role/RevenuesNarrativeDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019c96ab-9346-7730-94cf-71c5eadddc72" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019c96ab-9346-7b9a-9d1d-376edb4d15e1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c96ab-9346-7730-94cf-71c5eadddc72" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019c96ab-9346-7b9a-9d1d-376edb4d15e1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetNetCurrent_019c96ab-9346-7809-8735-c008c55c0f3e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerAssetNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c96ab-9346-7730-94cf-71c5eadddc72" xlink:to="loc_us-gaap_ContractWithCustomerAssetNetCurrent_019c96ab-9346-7809-8735-c008c55c0f3e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetNetNoncurrent_019c96ab-9346-7ed7-836b-ef53f2021f71" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerAssetNetNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c96ab-9346-7730-94cf-71c5eadddc72" xlink:to="loc_us-gaap_ContractWithCustomerAssetNetNoncurrent_019c96ab-9346-7ed7-836b-ef53f2021f71" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_019dad09-8e40-79e1-b8d0-058f947a854c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c96ab-9346-7730-94cf-71c5eadddc72" xlink:to="loc_us-gaap_ContractWithCustomerLiability_019dad09-8e40-79e1-b8d0-058f947a854c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019c96ab-9346-7177-94d7-c8c3b7b61107" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c96ab-9346-7730-94cf-71c5eadddc72" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019c96ab-9346-7177-94d7-c8c3b7b61107" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019c96ab-9346-7512-9d66-ba72dac12e20" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c96ab-9346-7730-94cf-71c5eadddc72" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019c96ab-9346-7512-9d66-ba72dac12e20" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.holcim.com/role/AcquisitionsNarrativeDetails" xlink:type="simple" xlink:href="holcim-20260331.xsd#AcquisitionsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.holcim.com/role/AcquisitionsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019c96ab-9346-7e58-bbd1-af950979f107" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c96ab-9346-721b-8877-949bd6922a63" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c96ab-9346-7e58-bbd1-af950979f107" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c96ab-9346-721b-8877-949bd6922a63" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019c96ab-9346-7133-be24-dcc094cbd334" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c96ab-9346-721b-8877-949bd6922a63" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019c96ab-9346-7133-be24-dcc094cbd334" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c96ab-9346-7133-be24-dcc094cbd334_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c96ab-9346-7133-be24-dcc094cbd334" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c96ab-9346-7133-be24-dcc094cbd334_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c96ab-9346-7527-9cfc-78ad0f2ca2de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c96ab-9346-7133-be24-dcc094cbd334" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c96ab-9346-7527-9cfc-78ad0f2ca2de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_019c96ab-9346-7608-906e-7e9ba6800dfb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c96ab-9346-7527-9cfc-78ad0f2ca2de" xlink:to="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_019c96ab-9346-7608-906e-7e9ba6800dfb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_019d88bb-9391-75af-9915-23301ce2e543" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c96ab-9346-7e58-bbd1-af950979f107" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_019d88bb-9391-75af-9915-23301ce2e543" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.holcim.com/role/AcquisitionsScheduleofBusinessCombinationsDetails" xlink:type="simple" xlink:href="holcim-20260331.xsd#AcquisitionsScheduleofBusinessCombinationsDetails"/>
  <link:definitionLink xlink:role="http://www.holcim.com/role/AcquisitionsScheduleofBusinessCombinationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019c96ab-9346-7060-95a6-f9c3e37172d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c96ab-9346-7c9a-853d-0ef625ac3cff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c96ab-9346-7060-95a6-f9c3e37172d3" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c96ab-9346-7c9a-853d-0ef625ac3cff" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019c96ab-9346-74cb-ae63-c9a1ad5de55e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019c96ab-9346-7c9a-853d-0ef625ac3cff" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019c96ab-9346-74cb-ae63-c9a1ad5de55e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c96ab-9346-74cb-ae63-c9a1ad5de55e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c96ab-9346-74cb-ae63-c9a1ad5de55e" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c96ab-9346-74cb-ae63-c9a1ad5de55e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c96ab-9346-758a-b952-ff33642e0b76" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019c96ab-9346-74cb-ae63-c9a1ad5de55e" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c96ab-9346-758a-b952-ff33642e0b76" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_019c96ab-9346-79ca-a2e5-f15fbfdb68ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019c96ab-9346-758a-b952-ff33642e0b76" xlink:to="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_019c96ab-9346-79ca-a2e5-f15fbfdb68ec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019c96ab-9346-7dfc-a147-e7a91278cae0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c96ab-9346-7060-95a6-f9c3e37172d3" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019c96ab-9346-7dfc-a147-e7a91278cae0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterestAbstract_019c96ab-9346-71fa-859c-c4ae536f630a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterestAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c96ab-9346-7060-95a6-f9c3e37172d3" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterestAbstract_019c96ab-9346-71fa-859c-c4ae536f630a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_019c96ab-9346-77dc-97a2-81e02dce145e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterestAbstract_019c96ab-9346-71fa-859c-c4ae536f630a" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_019c96ab-9346-77dc-97a2-81e02dce145e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019c96ab-9346-7d4f-a8e7-913d7e5235c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterestAbstract_019c96ab-9346-71fa-859c-c4ae536f630a" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019c96ab-9346-7d4f-a8e7-913d7e5235c7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_019c96ab-9346-7c8a-aea2-2772a8200f14" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterestAbstract_019c96ab-9346-71fa-859c-c4ae536f630a" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_019c96ab-9346-7c8a-aea2-2772a8200f14" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_BusinessCombinationRecognizedAssetAcquiredNetWorkingCapital_019c96ab-9346-7624-ae48-33851b3b549d" xlink:href="holcim-20260331.xsd#holcim_BusinessCombinationRecognizedAssetAcquiredNetWorkingCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterestAbstract_019c96ab-9346-71fa-859c-c4ae536f630a" xlink:to="loc_holcim_BusinessCombinationRecognizedAssetAcquiredNetWorkingCapital_019c96ab-9346-7624-ae48-33851b3b549d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_019d9aac-f84a-7f5f-8ed5-d133f6b94da1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterestAbstract_019c96ab-9346-71fa-859c-c4ae536f630a" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_019d9aac-f84a-7f5f-8ed5-d133f6b94da1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_019d2297-9976-7c15-92d4-3f41a881259d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterestAbstract_019c96ab-9346-71fa-859c-c4ae536f630a" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_019d2297-9976-7c15-92d4-3f41a881259d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_019c96ab-9346-7abc-bc33-59ffe87a5bc5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterestAbstract_019c96ab-9346-71fa-859c-c4ae536f630a" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_019c96ab-9346-7abc-bc33-59ffe87a5bc5" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019c96ab-9346-730a-b417-430687bcef87" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterestAbstract_019c96ab-9346-71fa-859c-c4ae536f630a" xlink:to="loc_us-gaap_Goodwill_019c96ab-9346-730a-b417-430687bcef87" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_019c96ab-9346-75f3-9696-213f30d1e4c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterestAbstract_019c96ab-9346-71fa-859c-c4ae536f630a" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_019c96ab-9346-75f3-9696-213f30d1e4c3" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.holcim.com/role/AccountsreceivablenetScheduleofAccountsReceivableDetails" xlink:type="simple" xlink:href="holcim-20260331.xsd#AccountsreceivablenetScheduleofAccountsReceivableDetails"/>
  <link:definitionLink xlink:role="http://www.holcim.com/role/AccountsreceivablenetScheduleofAccountsReceivableDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019c96ab-9347-79f2-a226-81249c297fb0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019c96ab-9347-7967-ace8-49b1fd1222db" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019c96ab-9347-79f2-a226-81249c297fb0" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019c96ab-9347-7967-ace8-49b1fd1222db" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c96ab-9347-7cee-ba55-705c0d947bd7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019c96ab-9347-7967-ace8-49b1fd1222db" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c96ab-9347-7cee-ba55-705c0d947bd7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c96ab-9347-7cee-ba55-705c0d947bd7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c96ab-9347-7cee-ba55-705c0d947bd7" xlink:to="loc_us-gaap_RelatedPartyDomain_019c96ab-9347-7cee-ba55-705c0d947bd7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c96ab-9347-7a6e-b152-e84c6736faeb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c96ab-9347-7cee-ba55-705c0d947bd7" xlink:to="loc_us-gaap_RelatedPartyDomain_019c96ab-9347-7a6e-b152-e84c6736faeb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonrelatedPartyMember_019c96ab-9347-7587-b3de-002012d0099a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonrelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c96ab-9347-7a6e-b152-e84c6736faeb" xlink:to="loc_us-gaap_NonrelatedPartyMember_019c96ab-9347-7587-b3de-002012d0099a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableGrossCurrent_019c96ab-9347-7337-b7f1-c95cd7b310b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableGrossCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019c96ab-9347-79f2-a226-81249c297fb0" xlink:to="loc_us-gaap_AccountsReceivableGrossCurrent_019c96ab-9347-7337-b7f1-c95cd7b310b0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_019c96ab-9347-7265-ad8e-5ba0e2a827fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019c96ab-9347-79f2-a226-81249c297fb0" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_019c96ab-9347-7265-ad8e-5ba0e2a827fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherReceivablesNetCurrent_019c96ab-9347-70c1-a9af-47fd3dcb9c51" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherReceivablesNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019c96ab-9347-79f2-a226-81249c297fb0" xlink:to="loc_us-gaap_OtherReceivablesNetCurrent_019c96ab-9347-70c1-a9af-47fd3dcb9c51" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsAndOtherReceivablesNetCurrent_019c96ab-9347-7428-be72-3e247f1271b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsAndOtherReceivablesNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019c96ab-9347-79f2-a226-81249c297fb0" xlink:to="loc_us-gaap_AccountsAndOtherReceivablesNetCurrent_019c96ab-9347-7428-be72-3e247f1271b5" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.holcim.com/role/PropertyplantandequipmentnetScheduleofPropertyPlantandEquipmentDetails" xlink:type="simple" xlink:href="holcim-20260331.xsd#PropertyplantandequipmentnetScheduleofPropertyPlantandEquipmentDetails"/>
  <link:definitionLink xlink:role="http://www.holcim.com/role/PropertyplantandequipmentnetScheduleofPropertyPlantandEquipmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019c96ab-9347-7955-a6e9-ea7ba0d089fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019c96ab-9347-72c2-ba05-f71a2bb8f2b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019c96ab-9347-7955-a6e9-ea7ba0d089fe" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019c96ab-9347-72c2-ba05-f71a2bb8f2b1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019c96ab-9347-70f5-8058-520942f311c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019c96ab-9347-72c2-ba05-f71a2bb8f2b1" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019c96ab-9347-70f5-8058-520942f311c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019c96ab-9347-70f5-8058-520942f311c7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019c96ab-9347-70f5-8058-520942f311c7" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019c96ab-9347-70f5-8058-520942f311c7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019c96ab-9347-722b-953c-dcee7a8a22c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019c96ab-9347-70f5-8058-520942f311c7" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019c96ab-9347-722b-953c-dcee7a8a22c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_LandAndMineralReservesMember_019c96ab-9347-7e13-8ed8-ed178a57ec73" xlink:href="holcim-20260331.xsd#holcim_LandAndMineralReservesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019c96ab-9347-722b-953c-dcee7a8a22c3" xlink:to="loc_holcim_LandAndMineralReservesMember_019c96ab-9347-7e13-8ed8-ed178a57ec73" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingAndBuildingImprovementsMember_019c96ab-9347-7f4b-a82a-2eed1b48c958" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BuildingAndBuildingImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019c96ab-9347-722b-953c-dcee7a8a22c3" xlink:to="loc_us-gaap_BuildingAndBuildingImprovementsMember_019c96ab-9347-7f4b-a82a-2eed1b48c958" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_MachinesFurnitureVehiclesAndToolsMember_019c96ab-9347-7a2c-b99c-fd1bcdaf35dd" xlink:href="holcim-20260331.xsd#holcim_MachinesFurnitureVehiclesAndToolsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019c96ab-9347-722b-953c-dcee7a8a22c3" xlink:to="loc_holcim_MachinesFurnitureVehiclesAndToolsMember_019c96ab-9347-7a2c-b99c-fd1bcdaf35dd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionInProgressMember_019c96ab-9347-7796-897d-3de4edd83734" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConstructionInProgressMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019c96ab-9347-722b-953c-dcee7a8a22c3" xlink:to="loc_us-gaap_ConstructionInProgressMember_019c96ab-9347-7796-897d-3de4edd83734" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_019c96ab-9347-7b9d-b21d-94399f7dc765" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019c96ab-9347-7955-a6e9-ea7ba0d089fe" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_019c96ab-9347-7b9d-b21d-94399f7dc765" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization_019c96ab-9347-7017-9086-fbf644454903" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019c96ab-9347-7955-a6e9-ea7ba0d089fe" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization_019c96ab-9347-7017-9086-fbf644454903" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_019c96ab-9347-706f-b71c-98a33ed868b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019c96ab-9347-7955-a6e9-ea7ba0d089fe" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_019c96ab-9347-706f-b71c-98a33ed868b6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_019c96ab-9347-7b2e-a76c-33025daacfc0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019c96ab-9347-7955-a6e9-ea7ba0d089fe" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_019c96ab-9347-7b2e-a76c-33025daacfc0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_019c96ab-9347-711b-a237-f3c67d342d22" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019c96ab-9347-7955-a6e9-ea7ba0d089fe" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_019c96ab-9347-711b-a237-f3c67d342d22" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.holcim.com/role/GoodwillandintangibleassetsnetScheduleofChangesinGoodwillDetails" xlink:type="simple" xlink:href="holcim-20260331.xsd#GoodwillandintangibleassetsnetScheduleofChangesinGoodwillDetails"/>
  <link:definitionLink xlink:role="http://www.holcim.com/role/GoodwillandintangibleassetsnetScheduleofChangesinGoodwillDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_019c96ab-9347-7600-9919-856823ded232" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_019c96ab-9347-712b-ad16-71869a909500" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_019c96ab-9347-7600-9919-856823ded232" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_019c96ab-9347-712b-ad16-71869a909500" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c96ab-9347-7534-8005-ce040a50f08d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_019c96ab-9347-712b-ad16-71869a909500" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c96ab-9347-7534-8005-ce040a50f08d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c96ab-9347-7534-8005-ce040a50f08d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c96ab-9347-7534-8005-ce040a50f08d" xlink:to="loc_us-gaap_SegmentDomain_019c96ab-9347-7534-8005-ce040a50f08d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c96ab-9347-7f48-a5dc-243afce7bc4a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c96ab-9347-7534-8005-ce040a50f08d" xlink:to="loc_us-gaap_SegmentDomain_019c96ab-9347-7f48-a5dc-243afce7bc4a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_BuildingMaterialsMember_019c96ab-9347-78d9-807a-775e80ba6cf1" xlink:href="holcim-20260331.xsd#holcim_BuildingMaterialsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c96ab-9347-7f48-a5dc-243afce7bc4a" xlink:to="loc_holcim_BuildingMaterialsMember_019c96ab-9347-78d9-807a-775e80ba6cf1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_BuildingEnvelopeMember_019c96ab-9347-7619-9108-8577c5fbaf22" xlink:href="holcim-20260331.xsd#holcim_BuildingEnvelopeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c96ab-9347-7f48-a5dc-243afce7bc4a" xlink:to="loc_holcim_BuildingEnvelopeMember_019c96ab-9347-7619-9108-8577c5fbaf22" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_019c96ab-9347-79d8-92b6-47c08242ad61" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_019c96ab-9347-7600-9919-856823ded232" xlink:to="loc_us-gaap_GoodwillRollForward_019c96ab-9347-79d8-92b6-47c08242ad61" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019c96ab-9347-7729-b6de-a4bcdca26006" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_019c96ab-9347-79d8-92b6-47c08242ad61" xlink:to="loc_us-gaap_Goodwill_019c96ab-9347-7729-b6de-a4bcdca26006" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_019c96ab-9347-7c44-bfae-f33dc8817fa7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillAcquiredDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_019c96ab-9347-79d8-92b6-47c08242ad61" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_019c96ab-9347-7c44-bfae-f33dc8817fa7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments_019c96ab-9347-73dd-9f63-24da68c4ce5e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_019c96ab-9347-79d8-92b6-47c08242ad61" xlink:to="loc_us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments_019c96ab-9347-73dd-9f63-24da68c4ce5e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019c96ab-9347-758c-9d09-d3f65dabdff4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.holcim.com/role/DebtScheduleofLongTermDebtDetails" xlink:type="simple" xlink:href="holcim-20260331.xsd#DebtScheduleofLongTermDebtDetails"/>
  <link:definitionLink xlink:role="http://www.holcim.com/role/DebtScheduleofLongTermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019c96ab-9347-75cb-81ab-1144340c22c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019c96ab-9347-72a6-ab08-cdf55759e5c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c96ab-9347-75cb-81ab-1144340c22c7" xlink:to="loc_us-gaap_DebtInstrumentTable_019c96ab-9347-72a6-ab08-cdf55759e5c8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019c96ab-9347-7b00-8168-29dcdde9d880" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c96ab-9347-72a6-ab08-cdf55759e5c8" xlink:to="loc_us-gaap_DebtInstrumentAxis_019c96ab-9347-7b00-8168-29dcdde9d880" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c96ab-9347-7b00-8168-29dcdde9d880_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c96ab-9347-7b00-8168-29dcdde9d880" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c96ab-9347-7b00-8168-29dcdde9d880_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c96ab-9347-7b3f-8345-a8fc7b42c966" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c96ab-9347-7b00-8168-29dcdde9d880" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c96ab-9347-7b3f-8345-a8fc7b42c966" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_A3.50UnsecuredNotesMember_019c96ab-9347-70dd-ae09-7aa084f7f6b0" xlink:href="holcim-20260331.xsd#holcim_A3.50UnsecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c96ab-9347-7b3f-8345-a8fc7b42c966" xlink:to="loc_holcim_A3.50UnsecuredNotesMember_019c96ab-9347-70dd-ae09-7aa084f7f6b0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_A4.75UnsecuredNotesMember_019c96ab-9347-7f97-96cf-25fdf2d296aa" xlink:href="holcim-20260331.xsd#holcim_A4.75UnsecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c96ab-9347-7b3f-8345-a8fc7b42c966" xlink:to="loc_holcim_A4.75UnsecuredNotesMember_019c96ab-9347-7f97-96cf-25fdf2d296aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_A4.60UnsecuredNotesMember_019c96ab-9347-73ba-83cf-c7632854c3a0" xlink:href="holcim-20260331.xsd#holcim_A4.60UnsecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c96ab-9347-7b3f-8345-a8fc7b42c966" xlink:to="loc_holcim_A4.60UnsecuredNotesMember_019c96ab-9347-73ba-83cf-c7632854c3a0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_A4.70UnsecuredNotesMember_019c96ab-9347-71db-ab50-477490a25ec1" xlink:href="holcim-20260331.xsd#holcim_A4.70UnsecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c96ab-9347-7b3f-8345-a8fc7b42c966" xlink:to="loc_holcim_A4.70UnsecuredNotesMember_019c96ab-9347-71db-ab50-477490a25ec1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_A4.95UnsecuredNotesMember_019c96ab-9347-7f26-a49f-a06ba85f9ec8" xlink:href="holcim-20260331.xsd#holcim_A4.95UnsecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c96ab-9347-7b3f-8345-a8fc7b42c966" xlink:to="loc_holcim_A4.95UnsecuredNotesMember_019c96ab-9347-7f26-a49f-a06ba85f9ec8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_A5.40UnsecuredNotesMember_019c96ab-9347-722e-a11f-b03f23e000c0" xlink:href="holcim-20260331.xsd#holcim_A5.40UnsecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c96ab-9347-7b3f-8345-a8fc7b42c966" xlink:to="loc_holcim_A5.40UnsecuredNotesMember_019c96ab-9347-722e-a11f-b03f23e000c0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_A7.125UnsecuredNotesMember_019c96ab-9347-74b1-9c6b-d3da95b3d1ac" xlink:href="holcim-20260331.xsd#holcim_A7.125UnsecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c96ab-9347-7b3f-8345-a8fc7b42c966" xlink:to="loc_holcim_A7.125UnsecuredNotesMember_019c96ab-9347-74b1-9c6b-d3da95b3d1ac" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_A6.875UnsecuredNotesMember_019c96ab-9347-7eec-a4f5-f620f7bd0dcb" xlink:href="holcim-20260331.xsd#holcim_A6.875UnsecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c96ab-9347-7b3f-8345-a8fc7b42c966" xlink:to="loc_holcim_A6.875UnsecuredNotesMember_019c96ab-9347-7eec-a4f5-f620f7bd0dcb" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_A6.50UnsecuredNotesMember_019c96ab-9347-7553-82b2-ddd8c1621031" xlink:href="holcim-20260331.xsd#holcim_A6.50UnsecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c96ab-9347-7b3f-8345-a8fc7b42c966" xlink:to="loc_holcim_A6.50UnsecuredNotesMember_019c96ab-9347-7553-82b2-ddd8c1621031" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_A4.20UnsecuredNotesMember_019c96ab-9347-7d8d-856c-1771884f254f" xlink:href="holcim-20260331.xsd#holcim_A4.20UnsecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c96ab-9347-7b3f-8345-a8fc7b42c966" xlink:to="loc_holcim_A4.20UnsecuredNotesMember_019c96ab-9347-7d8d-856c-1771884f254f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_A7.65NotesMember_019c96ab-9347-7889-8389-2b36206bad8b" xlink:href="holcim-20260331.xsd#holcim_A7.65NotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c96ab-9347-7b3f-8345-a8fc7b42c966" xlink:to="loc_holcim_A7.65NotesMember_019c96ab-9347-7889-8389-2b36206bad8b" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019c96ab-9347-7279-a3c3-623fbc150bc8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c96ab-9347-72a6-ab08-cdf55759e5c8" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019c96ab-9347-7279-a3c3-623fbc150bc8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c96ab-9347-7279-a3c3-623fbc150bc8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c96ab-9347-7279-a3c3-623fbc150bc8" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c96ab-9347-7279-a3c3-623fbc150bc8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c96ab-9347-724d-b527-86cb414a8e54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c96ab-9347-7279-a3c3-623fbc150bc8" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c96ab-9347-724d-b527-86cb414a8e54" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebtMember_019c96ab-9347-7891-a6a0-2e47ca8dfd3a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnsecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c96ab-9347-724d-b527-86cb414a8e54" xlink:to="loc_us-gaap_UnsecuredDebtMember_019c96ab-9347-7891-a6a0-2e47ca8dfd3a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_019c96ab-9347-7b03-9f0c-c1db87de7937" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c96ab-9347-724d-b527-86cb414a8e54" xlink:to="loc_us-gaap_SecuredDebtMember_019c96ab-9347-7b03-9f0c-c1db87de7937" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_OtherLongTermDebtMember_019c96ab-9347-76cf-b7b0-b582e9024b9f" xlink:href="holcim-20260331.xsd#holcim_OtherLongTermDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c96ab-9347-724d-b527-86cb414a8e54" xlink:to="loc_holcim_OtherLongTermDebtMember_019c96ab-9347-76cf-b7b0-b582e9024b9f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c96ab-9347-77b6-a6de-eb69b8659488" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c96ab-9347-72a6-ab08-cdf55759e5c8" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c96ab-9347-77b6-a6de-eb69b8659488" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c96ab-9347-77b6-a6de-eb69b8659488_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c96ab-9347-77b6-a6de-eb69b8659488" xlink:to="loc_us-gaap_RelatedPartyDomain_019c96ab-9347-77b6-a6de-eb69b8659488_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c96ab-9347-7aca-ad3a-cfaac4b1edba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c96ab-9347-77b6-a6de-eb69b8659488" xlink:to="loc_us-gaap_RelatedPartyDomain_019c96ab-9347-7aca-ad3a-cfaac4b1edba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonrelatedPartyMember_019c96ab-9347-74dd-9b80-7ffa23cd431b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonrelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c96ab-9347-7aca-ad3a-cfaac4b1edba" xlink:to="loc_us-gaap_NonrelatedPartyMember_019c96ab-9347-74dd-9b80-7ffa23cd431b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019c96ab-9347-7fc7-a43b-0d6fa184560d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c96ab-9347-75cb-81ab-1144340c22c7" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019c96ab-9347-7fc7-a43b-0d6fa184560d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_019c96ab-9347-7af6-b812-5416a1376078" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c96ab-9347-75cb-81ab-1144340c22c7" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_019c96ab-9347-7af6-b812-5416a1376078" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_019c96ab-9347-753a-b112-f3fc578c383f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c96ab-9347-75cb-81ab-1144340c22c7" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_019c96ab-9347-753a-b112-f3fc578c383f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019c96ab-9347-717d-8189-8ca8d9f45edc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c96ab-9347-75cb-81ab-1144340c22c7" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019c96ab-9347-717d-8189-8ca8d9f45edc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019c96ab-9347-73e4-a06f-b63755e82cec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c96ab-9347-75cb-81ab-1144340c22c7" xlink:to="loc_us-gaap_LongTermDebt_019c96ab-9347-73e4-a06f-b63755e82cec" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_019c96ab-9347-7080-a3bf-e7114a9844dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c96ab-9347-75cb-81ab-1144340c22c7" xlink:to="loc_us-gaap_LongTermDebtCurrent_019c96ab-9347-7080-a3bf-e7114a9844dd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_019c96ab-9347-7158-b964-18dbba399e52" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c96ab-9347-75cb-81ab-1144340c22c7" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_019c96ab-9347-7158-b964-18dbba399e52" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.holcim.com/role/DebtNarrativeDetails" xlink:type="simple" xlink:href="holcim-20260331.xsd#DebtNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.holcim.com/role/DebtNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019d9a9d-7d88-7fb9-b6cd-f1b3db649221" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019c96ab-9347-7d1a-93ed-f52414dea627" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019d9a9d-7d88-7fb9-b6cd-f1b3db649221" xlink:to="loc_us-gaap_DebtInstrumentTable_019c96ab-9347-7d1a-93ed-f52414dea627" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019d9a9d-7d88-7d7d-a4fe-1cf5f296552b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c96ab-9347-7d1a-93ed-f52414dea627" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019d9a9d-7d88-7d7d-a4fe-1cf5f296552b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019d9a9d-7d88-7d7d-a4fe-1cf5f296552b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019d9a9d-7d88-7d7d-a4fe-1cf5f296552b" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019d9a9d-7d88-7d7d-a4fe-1cf5f296552b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019d9a9d-7d88-7ee8-95c1-358187920d34" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019d9a9d-7d88-7d7d-a4fe-1cf5f296552b" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019d9a9d-7d88-7ee8-95c1-358187920d34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019d9a9d-7d88-709f-a1f7-35e8620f991f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019d9a9d-7d88-7ee8-95c1-358187920d34" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019d9a9d-7d88-709f-a1f7-35e8620f991f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019d9a9d-7d88-7d5d-9ea8-c590d097ab47" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c96ab-9347-7d1a-93ed-f52414dea627" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019d9a9d-7d88-7d5d-9ea8-c590d097ab47" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019d9a9d-7d88-7d5d-9ea8-c590d097ab47_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019d9a9d-7d88-7d5d-9ea8-c590d097ab47" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019d9a9d-7d88-7d5d-9ea8-c590d097ab47_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019d9a9d-7d88-754e-a9c7-f0ff4f993227" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019d9a9d-7d88-7d5d-9ea8-c590d097ab47" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019d9a9d-7d88-754e-a9c7-f0ff4f993227" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebtMember_019d9a9d-7d88-7f96-860f-4347287f3817" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnsecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019d9a9d-7d88-754e-a9c7-f0ff4f993227" xlink:to="loc_us-gaap_UnsecuredDebtMember_019d9a9d-7d88-7f96-860f-4347287f3817" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019d9aaf-f4b2-7c0a-977e-7382f3a70079" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019d9a9d-7d88-754e-a9c7-f0ff4f993227" xlink:to="loc_us-gaap_LineOfCreditMember_019d9aaf-f4b2-7c0a-977e-7382f3a70079" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019d9a9d-93da-7d11-bfd6-020a9badbb18" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c96ab-9347-7d1a-93ed-f52414dea627" xlink:to="loc_us-gaap_DebtInstrumentAxis_019d9a9d-93da-7d11-bfd6-020a9badbb18" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019d9a9d-93da-7d11-bfd6-020a9badbb18_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019d9a9d-93da-7d11-bfd6-020a9badbb18" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019d9a9d-93da-7d11-bfd6-020a9badbb18_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019d9a9d-93da-7161-8d62-295dbf7c59eb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019d9a9d-93da-7d11-bfd6-020a9badbb18" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019d9a9d-93da-7161-8d62-295dbf7c59eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_CommericalPaperProgramMember_019d9a9d-93da-73ae-8419-a2d10333e984" xlink:href="holcim-20260331.xsd#holcim_CommericalPaperProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019d9a9d-93da-7161-8d62-295dbf7c59eb" xlink:to="loc_holcim_CommericalPaperProgramMember_019d9a9d-93da-73ae-8419-a2d10333e984" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_TheRevolvingCreditFacilityMember_019d9aaf-f4b2-7557-83d2-a8c27f19c31e" xlink:href="holcim-20260331.xsd#holcim_TheRevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019d9a9d-93da-7161-8d62-295dbf7c59eb" xlink:to="loc_holcim_TheRevolvingCreditFacilityMember_019d9aaf-f4b2-7557-83d2-a8c27f19c31e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeAxis_019d9a9d-93da-78d9-bc69-a84b7c803d3f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c96ab-9347-7d1a-93ed-f52414dea627" xlink:to="loc_us-gaap_ShortTermDebtTypeAxis_019d9a9d-93da-78d9-bc69-a84b7c803d3f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_019d9a9d-93da-78d9-bc69-a84b7c803d3f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_019d9a9d-93da-78d9-bc69-a84b7c803d3f" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_019d9a9d-93da-78d9-bc69-a84b7c803d3f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_019d9a9d-93da-745d-9086-e12a04b70858" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_019d9a9d-93da-78d9-bc69-a84b7c803d3f" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_019d9a9d-93da-745d-9086-e12a04b70858" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPaperMember_019d9a9d-93da-759b-a338-e9be9d0cab6d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPaperMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtTypeDomain_019d9a9d-93da-745d-9086-e12a04b70858" xlink:to="loc_us-gaap_CommercialPaperMember_019d9a9d-93da-759b-a338-e9be9d0cab6d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019d9aaf-f4b2-71a4-ba14-44c9ac9fe1b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c96ab-9347-7d1a-93ed-f52414dea627" xlink:to="loc_us-gaap_CreditFacilityAxis_019d9aaf-f4b2-71a4-ba14-44c9ac9fe1b4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019d9aaf-f4b2-71a4-ba14-44c9ac9fe1b4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019d9aaf-f4b2-71a4-ba14-44c9ac9fe1b4" xlink:to="loc_us-gaap_CreditFacilityDomain_019d9aaf-f4b2-71a4-ba14-44c9ac9fe1b4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019d9aaf-f4b2-770a-9ce1-5098e9c42805" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019d9aaf-f4b2-71a4-ba14-44c9ac9fe1b4" xlink:to="loc_us-gaap_CreditFacilityDomain_019d9aaf-f4b2-770a-9ce1-5098e9c42805" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019d9aaf-f4b2-7f0d-9bb3-9e8e4f1955ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019d9aaf-f4b2-770a-9ce1-5098e9c42805" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019d9aaf-f4b2-7f0d-9bb3-9e8e4f1955ee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_019d9a9d-7d88-71af-8e26-76b6a19eee3a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019d9a9d-7d88-7fb9-b6cd-f1b3db649221" xlink:to="loc_us-gaap_LongTermDebtFairValue_019d9a9d-7d88-71af-8e26-76b6a19eee3a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_OtherLongTermDebtFairValue_019d9a9d-7d88-7527-b9eb-d8ef0a0c766b" xlink:href="holcim-20260331.xsd#holcim_OtherLongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019d9a9d-7d88-7fb9-b6cd-f1b3db649221" xlink:to="loc_holcim_OtherLongTermDebtFairValue_019d9a9d-7d88-7527-b9eb-d8ef0a0c766b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebt_019d9a9d-93da-73ae-86da-82b3a53ea21a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019d9a9d-7d88-7fb9-b6cd-f1b3db649221" xlink:to="loc_us-gaap_InterestExpenseDebt_019d9a9d-93da-73ae-86da-82b3a53ea21a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019d9a9d-93da-7d72-a4b1-0e51ca551331" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019d9a9d-7d88-7fb9-b6cd-f1b3db649221" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019d9a9d-93da-7d72-a4b1-0e51ca551331" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermBorrowings_019dace7-cf49-70c9-acf1-db5984e47265" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019d9a9d-7d88-7fb9-b6cd-f1b3db649221" xlink:to="loc_us-gaap_ShortTermBorrowings_019dace7-cf49-70c9-acf1-db5984e47265" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_019dbd13-8852-759f-bcb1-f5f039a84c90" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019d9a9d-7d88-7fb9-b6cd-f1b3db649221" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_019dbd13-8852-759f-bcb1-f5f039a84c90" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_019d9ab1-20d1-7fe5-aa2d-d28b576078f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019d9a9d-7d88-7fb9-b6cd-f1b3db649221" xlink:to="loc_us-gaap_DebtInstrumentTerm_019d9ab1-20d1-7fe5-aa2d-d28b576078f2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_DebtInstrumentCovenantTermsLeverageRatioMaximum_019d9ab1-510c-7071-b672-c27c5753960b" xlink:href="holcim-20260331.xsd#holcim_DebtInstrumentCovenantTermsLeverageRatioMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019d9a9d-7d88-7fb9-b6cd-f1b3db649221" xlink:to="loc_holcim_DebtInstrumentCovenantTermsLeverageRatioMaximum_019d9ab1-510c-7071-b672-c27c5753960b" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.holcim.com/role/DebtScheduleofFairValueDetails" xlink:type="simple" xlink:href="holcim-20260331.xsd#DebtScheduleofFairValueDetails"/>
  <link:definitionLink xlink:role="http://www.holcim.com/role/DebtScheduleofFairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019c96ab-9347-776d-9d31-b9ea7a3941d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019c96ab-9347-7735-88b1-b96a1278b4e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c96ab-9347-776d-9d31-b9ea7a3941d9" xlink:to="loc_us-gaap_DebtInstrumentTable_019c96ab-9347-7735-88b1-b96a1278b4e9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_019c96ab-9347-74d8-9db2-37cb072f50c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c96ab-9347-7735-88b1-b96a1278b4e9" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_019c96ab-9347-74d8-9db2-37cb072f50c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019c96ab-9347-74d8-9db2-37cb072f50c9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019c96ab-9347-74d8-9db2-37cb072f50c9" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019c96ab-9347-74d8-9db2-37cb072f50c9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019c96ab-9347-7478-87a5-3047f772312d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019c96ab-9347-74d8-9db2-37cb072f50c9" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019c96ab-9347-7478-87a5-3047f772312d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019c96ab-9347-7dde-9147-871da0c5b1bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019c96ab-9347-7478-87a5-3047f772312d" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019c96ab-9347-7dde-9147-871da0c5b1bf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019c96ab-9347-7617-a3da-5b65338d10e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019c96ab-9347-7dde-9147-871da0c5b1bf" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019c96ab-9347-7617-a3da-5b65338d10e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019c96ab-9347-7bf3-97e7-019f0b8157a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019c96ab-9347-7dde-9147-871da0c5b1bf" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019c96ab-9347-7bf3-97e7-019f0b8157a8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_019c96ab-9347-7e14-a108-8f1921ac70aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c96ab-9347-776d-9d31-b9ea7a3941d9" xlink:to="loc_us-gaap_LongTermDebtFairValue_019c96ab-9347-7e14-a108-8f1921ac70aa" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.holcim.com/role/SegmentinformationScheduleofReconciliationofRevenueDetails" xlink:type="simple" xlink:href="holcim-20260331.xsd#SegmentinformationScheduleofReconciliationofRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.holcim.com/role/SegmentinformationScheduleofReconciliationofRevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019c96ab-93ec-7182-abd6-8db2ef0aa303" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c96ab-93ec-7d37-b53f-f8cb8f11860d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c96ab-93ec-7182-abd6-8db2ef0aa303" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c96ab-93ec-7d37-b53f-f8cb8f11860d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c96ab-93ec-79ec-a773-9aaef765cbb9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c96ab-93ec-7d37-b53f-f8cb8f11860d" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c96ab-93ec-79ec-a773-9aaef765cbb9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c96ab-93ec-79ec-a773-9aaef765cbb9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c96ab-93ec-79ec-a773-9aaef765cbb9" xlink:to="loc_us-gaap_SegmentDomain_019c96ab-93ec-79ec-a773-9aaef765cbb9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c96ab-93ec-7abb-87db-9f903f52fff6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c96ab-93ec-79ec-a773-9aaef765cbb9" xlink:to="loc_us-gaap_SegmentDomain_019c96ab-93ec-7abb-87db-9f903f52fff6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_BuildingMaterialsMember_019c96ab-93ec-7433-90d6-543faf27c4bd" xlink:href="holcim-20260331.xsd#holcim_BuildingMaterialsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c96ab-93ec-7abb-87db-9f903f52fff6" xlink:to="loc_holcim_BuildingMaterialsMember_019c96ab-93ec-7433-90d6-543faf27c4bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_BuildingEnvelopeMember_019c96ab-93ec-7fcf-bbae-a803b7fa7d38" xlink:href="holcim-20260331.xsd#holcim_BuildingEnvelopeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c96ab-93ec-7abb-87db-9f903f52fff6" xlink:to="loc_holcim_BuildingEnvelopeMember_019c96ab-93ec-7fcf-bbae-a803b7fa7d38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019c96ab-93ec-757d-a0af-b8f03bf4bad4" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c96ab-93ec-7d37-b53f-f8cb8f11860d" xlink:to="loc_srt_ConsolidationItemsAxis_019c96ab-93ec-757d-a0af-b8f03bf4bad4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019c96ab-93ec-757d-a0af-b8f03bf4bad4_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019c96ab-93ec-757d-a0af-b8f03bf4bad4" xlink:to="loc_srt_ConsolidationItemsDomain_019c96ab-93ec-757d-a0af-b8f03bf4bad4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019c96ab-93ec-7299-8174-b84ffa74b868" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019c96ab-93ec-757d-a0af-b8f03bf4bad4" xlink:to="loc_srt_ConsolidationItemsDomain_019c96ab-93ec-7299-8174-b84ffa74b868" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019c96ab-93ec-7cba-a16c-a73b1960f61f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019c96ab-93ec-7299-8174-b84ffa74b868" xlink:to="loc_us-gaap_OperatingSegmentsMember_019c96ab-93ec-7cba-a16c-a73b1960f61f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019c96ab-93ec-718d-b562-4a62a3d4ba98" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c96ab-93ec-7182-abd6-8db2ef0aa303" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019c96ab-93ec-718d-b562-4a62a3d4ba98" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_019c96ab-93ec-7888-8732-0d940a885f55" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c96ab-93ec-7182-abd6-8db2ef0aa303" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_019c96ab-93ec-7888-8732-0d940a885f55" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingOtherItemAmount_019c96ab-93ec-750b-91b0-cdf13067d2d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingOtherItemAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c96ab-93ec-7182-abd6-8db2ef0aa303" xlink:to="loc_us-gaap_SegmentReportingOtherItemAmount_019c96ab-93ec-750b-91b0-cdf13067d2d5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_AdjustedEarningsBeforeInterestTaxDepreciationAndAmortization_019c96ab-93ec-709c-af60-15575dd58ea1" xlink:href="holcim-20260331.xsd#holcim_AdjustedEarningsBeforeInterestTaxDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c96ab-93ec-7182-abd6-8db2ef0aa303" xlink:to="loc_holcim_AdjustedEarningsBeforeInterestTaxDepreciationAndAmortization_019c96ab-93ec-709c-af60-15575dd58ea1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_019c96ab-93ec-7634-ab19-d0894a3e3f79" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c96ab-93ec-7182-abd6-8db2ef0aa303" xlink:to="loc_us-gaap_DepreciationAndAmortization_019c96ab-93ec-7634-ab19-d0894a3e3f79" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInterest_019c96ab-93ec-7f37-9bce-be01b6a33f7c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentIncomeInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c96ab-93ec-7182-abd6-8db2ef0aa303" xlink:to="loc_us-gaap_InvestmentIncomeInterest_019c96ab-93ec-7f37-9bce-be01b6a33f7c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_019c96ab-93ec-7c6b-8fb8-b7e2164fe279" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c96ab-93ec-7182-abd6-8db2ef0aa303" xlink:to="loc_us-gaap_InterestExpenseNonoperating_019c96ab-93ec-7c6b-8fb8-b7e2164fe279" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_AcquisitionAndIntegrationCosts_019c96ab-93ec-7800-8e3e-8824b10502f4" xlink:href="holcim-20260331.xsd#holcim_AcquisitionAndIntegrationCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c96ab-93ec-7182-abd6-8db2ef0aa303" xlink:to="loc_holcim_AcquisitionAndIntegrationCosts_019c96ab-93ec-7800-8e3e-8824b10502f4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationSettlementExpense_019c96ab-93ec-711a-af25-423d1dc60cbb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LitigationSettlementExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c96ab-93ec-7182-abd6-8db2ef0aa303" xlink:to="loc_us-gaap_LitigationSettlementExpense_019c96ab-93ec-711a-af25-423d1dc60cbb" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_RestructuringAndOtherCosts_019c96ab-93ec-7cc9-9002-84a020d82165" xlink:href="holcim-20260331.xsd#holcim_RestructuringAndOtherCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c96ab-93ec-7182-abd6-8db2ef0aa303" xlink:to="loc_holcim_RestructuringAndOtherCosts_019c96ab-93ec-7cc9-9002-84a020d82165" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_SpinOffRelatedCosts_019c96ab-93ec-7afb-aa6f-a4b6a9189b5f" xlink:href="holcim-20260331.xsd#holcim_SpinOffRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c96ab-93ec-7182-abd6-8db2ef0aa303" xlink:to="loc_holcim_SpinOffRelatedCosts_019c96ab-93ec-7afb-aa6f-a4b6a9189b5f" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_UnallocatedCorporateCosts_019c96ab-93ec-7447-a347-5f4f2ea902c9" xlink:href="holcim-20260331.xsd#holcim_UnallocatedCorporateCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c96ab-93ec-7182-abd6-8db2ef0aa303" xlink:to="loc_holcim_UnallocatedCorporateCosts_019c96ab-93ec-7447-a347-5f4f2ea902c9" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_019c96ab-93ec-75fa-986d-397289c7370d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c96ab-93ec-7182-abd6-8db2ef0aa303" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_019c96ab-93ec-75fa-986d-397289c7370d" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_SegmentReportingSegmentReconcilingItemsAmount_019c96ab-93ec-749e-b77f-8f234184eb65" xlink:href="holcim-20260331.xsd#holcim_SegmentReportingSegmentReconcilingItemsAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c96ab-93ec-7182-abd6-8db2ef0aa303" xlink:to="loc_holcim_SegmentReportingSegmentReconcilingItemsAmount_019c96ab-93ec-749e-b77f-8f234184eb65" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019c96ab-93ec-7002-a6fc-73c0c98a9353" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c96ab-93ec-7182-abd6-8db2ef0aa303" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019c96ab-93ec-7002-a6fc-73c0c98a9353" xlink:type="arc" order="14"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.holcim.com/role/SegmentinformationScheduleofCapitalExpendituresDetails" xlink:type="simple" xlink:href="holcim-20260331.xsd#SegmentinformationScheduleofCapitalExpendituresDetails"/>
  <link:definitionLink xlink:role="http://www.holcim.com/role/SegmentinformationScheduleofCapitalExpendituresDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019c96ab-93ec-7440-97cc-6beb057fe301" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c96ab-93ec-786e-9b5c-8d732b6d140e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c96ab-93ec-7440-97cc-6beb057fe301" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c96ab-93ec-786e-9b5c-8d732b6d140e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c96ab-93ec-7747-ad43-0575dbe41dd7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c96ab-93ec-786e-9b5c-8d732b6d140e" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c96ab-93ec-7747-ad43-0575dbe41dd7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c96ab-93ec-7747-ad43-0575dbe41dd7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c96ab-93ec-7747-ad43-0575dbe41dd7" xlink:to="loc_us-gaap_SegmentDomain_019c96ab-93ec-7747-ad43-0575dbe41dd7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c96ab-93ec-7c96-b7be-e3d8045fd19d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c96ab-93ec-7747-ad43-0575dbe41dd7" xlink:to="loc_us-gaap_SegmentDomain_019c96ab-93ec-7c96-b7be-e3d8045fd19d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_BuildingMaterialsMember_019c96ab-93ec-7504-9288-042cd5bc5859" xlink:href="holcim-20260331.xsd#holcim_BuildingMaterialsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c96ab-93ec-7c96-b7be-e3d8045fd19d" xlink:to="loc_holcim_BuildingMaterialsMember_019c96ab-93ec-7504-9288-042cd5bc5859" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_BuildingEnvelopeMember_019c96ab-93ec-73b9-8956-7cd1610af71f" xlink:href="holcim-20260331.xsd#holcim_BuildingEnvelopeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c96ab-93ec-7c96-b7be-e3d8045fd19d" xlink:to="loc_holcim_BuildingEnvelopeMember_019c96ab-93ec-73b9-8956-7cd1610af71f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_019c96ab-93ec-7bd6-8372-2b697c4536ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentExpenditureAdditionToLongLivedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c96ab-93ec-7440-97cc-6beb057fe301" xlink:to="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_019c96ab-93ec-7bd6-8372-2b697c4536ab" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.holcim.com/role/SegmentinformationScheduleofReconciliationofAssetsDetails" xlink:type="simple" xlink:href="holcim-20260331.xsd#SegmentinformationScheduleofReconciliationofAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.holcim.com/role/SegmentinformationScheduleofReconciliationofAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019c96ab-93ec-733b-96bf-e5265a70725a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c96ab-93ec-7c39-82c9-7f678489e027" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c96ab-93ec-733b-96bf-e5265a70725a" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c96ab-93ec-7c39-82c9-7f678489e027" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019c96ab-93ec-7877-921d-8f3a0ddf645e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c96ab-93ec-7c39-82c9-7f678489e027" xlink:to="loc_srt_ConsolidationItemsAxis_019c96ab-93ec-7877-921d-8f3a0ddf645e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019c96ab-93ec-7877-921d-8f3a0ddf645e_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019c96ab-93ec-7877-921d-8f3a0ddf645e" xlink:to="loc_srt_ConsolidationItemsDomain_019c96ab-93ec-7877-921d-8f3a0ddf645e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019c96ab-93ec-71cb-89fc-dda0a0c019c4" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019c96ab-93ec-7877-921d-8f3a0ddf645e" xlink:to="loc_srt_ConsolidationItemsDomain_019c96ab-93ec-71cb-89fc-dda0a0c019c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019c96ab-93ec-731f-ba68-b82b061c2cdb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019c96ab-93ec-71cb-89fc-dda0a0c019c4" xlink:to="loc_us-gaap_OperatingSegmentsMember_019c96ab-93ec-731f-ba68-b82b061c2cdb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MaterialReconcilingItemsMember_019c96ab-93ec-775d-aa6e-781e91fb6c15" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MaterialReconcilingItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019c96ab-93ec-71cb-89fc-dda0a0c019c4" xlink:to="loc_us-gaap_MaterialReconcilingItemsMember_019c96ab-93ec-775d-aa6e-781e91fb6c15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c96ab-93ec-74a3-874c-ddf4ce7a762a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c96ab-93ec-7c39-82c9-7f678489e027" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c96ab-93ec-74a3-874c-ddf4ce7a762a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c96ab-93ec-74a3-874c-ddf4ce7a762a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c96ab-93ec-74a3-874c-ddf4ce7a762a" xlink:to="loc_us-gaap_SegmentDomain_019c96ab-93ec-74a3-874c-ddf4ce7a762a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c96ab-93ec-7e7a-8e05-a2f636050606" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c96ab-93ec-74a3-874c-ddf4ce7a762a" xlink:to="loc_us-gaap_SegmentDomain_019c96ab-93ec-7e7a-8e05-a2f636050606" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_BuildingMaterialsMember_019c96ab-93ec-7f45-ae24-76940edfe228" xlink:href="holcim-20260331.xsd#holcim_BuildingMaterialsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c96ab-93ec-7e7a-8e05-a2f636050606" xlink:to="loc_holcim_BuildingMaterialsMember_019c96ab-93ec-7f45-ae24-76940edfe228" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_BuildingEnvelopeMember_019c96ab-93ec-7a74-af91-106fc594a5cd" xlink:href="holcim-20260331.xsd#holcim_BuildingEnvelopeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c96ab-93ec-7e7a-8e05-a2f636050606" xlink:to="loc_holcim_BuildingEnvelopeMember_019c96ab-93ec-7a74-af91-106fc594a5cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019c96ab-93ec-70a0-858a-5edbebf279b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c96ab-93ec-733b-96bf-e5265a70725a" xlink:to="loc_us-gaap_Assets_019c96ab-93ec-70a0-858a-5edbebf279b1" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.holcim.com/role/PensionandotherpostretirementbenefitsDetails" xlink:type="simple" xlink:href="holcim-20260331.xsd#PensionandotherpostretirementbenefitsDetails"/>
  <link:definitionLink xlink:role="http://www.holcim.com/role/PensionandotherpostretirementbenefitsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_019d860a-5542-7062-a32d-2ee3cfc49c63" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_019d860a-5542-75b4-8b2f-f48fc9e8f9c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_019d860a-5542-7062-a32d-2ee3cfc49c63" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_019d860a-5542-75b4-8b2f-f48fc9e8f9c6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_019d860a-5542-7410-8ed9-063605c57e5e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_019d860a-5542-75b4-8b2f-f48fc9e8f9c6" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_019d860a-5542-7410-8ed9-063605c57e5e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019d860a-5542-7410-8ed9-063605c57e5e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019d860a-5542-7410-8ed9-063605c57e5e" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019d860a-5542-7410-8ed9-063605c57e5e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019d860a-5542-7cbf-8cab-24943aab2372" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019d860a-5542-7410-8ed9-063605c57e5e" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019d860a-5542-7cbf-8cab-24943aab2372" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_019d860a-5542-730c-acba-f6eb4a5b6434" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019d860a-5542-7cbf-8cab-24943aab2372" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_019d860a-5542-730c-acba-f6eb4a5b6434" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_019d860a-5542-7089-9724-c717056d7c88" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019d860a-5542-7cbf-8cab-24943aab2372" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_019d860a-5542-7089-9724-c717056d7c88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_019d860a-5542-7fdb-a4a4-f67f68c34896" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_019d860a-5542-7062-a32d-2ee3cfc49c63" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_019d860a-5542-7fdb-a4a4-f67f68c34896" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanCostRecognized_019d860a-e514-7149-bfaf-269faa20e6d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedContributionPlanCostRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_019d860a-5542-7062-a32d-2ee3cfc49c63" xlink:to="loc_us-gaap_DefinedContributionPlanCostRecognized_019d860a-e514-7149-bfaf-269faa20e6d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlanEmployerContributionCost_019d860a-e514-77f0-8de5-10126917973b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MultiemployerPlanEmployerContributionCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_019d860a-5542-7062-a32d-2ee3cfc49c63" xlink:to="loc_us-gaap_MultiemployerPlanEmployerContributionCost_019d860a-e514-77f0-8de5-10126917973b" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.holcim.com/role/AccumulatedothercomprehensivelossScheduleofAOCIDetails" xlink:type="simple" xlink:href="holcim-20260331.xsd#AccumulatedothercomprehensivelossScheduleofAOCIDetails"/>
  <link:definitionLink xlink:role="http://www.holcim.com/role/AccumulatedothercomprehensivelossScheduleofAOCIDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c96ab-93ec-72a4-abc0-ea2d5afb12f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019c96ab-93ec-7f94-bf65-3c4eb86d7cca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c96ab-93ec-72a4-abc0-ea2d5afb12f5" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019c96ab-93ec-7f94-bf65-3c4eb86d7cca" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019c96ab-93ec-7748-a6be-5d589e3473ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019c96ab-93ec-7f94-bf65-3c4eb86d7cca" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019c96ab-93ec-7748-a6be-5d589e3473ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c96ab-93ec-7748-a6be-5d589e3473ae_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c96ab-93ec-7748-a6be-5d589e3473ae" xlink:to="loc_us-gaap_EquityComponentDomain_019c96ab-93ec-7748-a6be-5d589e3473ae_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c96ab-93ec-746c-81d8-2cccda598203" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c96ab-93ec-7748-a6be-5d589e3473ae" xlink:to="loc_us-gaap_EquityComponentDomain_019c96ab-93ec-746c-81d8-2cccda598203" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019c96ab-93ec-744f-9744-c9ec6066f868" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c96ab-93ec-746c-81d8-2cccda598203" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019c96ab-93ec-744f-9744-c9ec6066f868" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_019c96ab-93ec-7837-ab75-7fce6a1f774a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c96ab-93ec-746c-81d8-2cccda598203" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_019c96ab-93ec-7837-ab75-7fce6a1f774a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_019c96ab-93ec-7bae-8d05-5d8b464f2cb7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c96ab-93ec-746c-81d8-2cccda598203" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_019c96ab-93ec-7bae-8d05-5d8b464f2cb7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c96ab-93ec-7600-ad79-c7aa2d06c73f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c96ab-93ec-746c-81d8-2cccda598203" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c96ab-93ec-7600-ad79-c7aa2d06c73f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedForeignCurrencyAdjustmentAttributableToNoncontrollingInterestMember_019cd0c8-9138-7cf4-b491-11ba5af8035a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedForeignCurrencyAdjustmentAttributableToNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c96ab-93ec-746c-81d8-2cccda598203" xlink:to="loc_us-gaap_AccumulatedForeignCurrencyAdjustmentAttributableToNoncontrollingInterestMember_019cd0c8-9138-7cf4-b491-11ba5af8035a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeNoncontrollingInterestMember_019cd0c8-9138-7485-b7ce-d1758a7ac682" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c96ab-93ec-746c-81d8-2cccda598203" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeNoncontrollingInterestMember_019cd0c8-9138-7485-b7ce-d1758a7ac682" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentAttributableToNoncontrollingInterestMember_019cd0c8-9138-797a-bc7b-9f0562dd5ffb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentAttributableToNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c96ab-93ec-746c-81d8-2cccda598203" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentAttributableToNoncontrollingInterestMember_019cd0c8-9138-797a-bc7b-9f0562dd5ffb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociAttributableToNoncontrollingInterestMember_019cd0c8-9138-7d90-8e14-c0038491f704" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AociAttributableToNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c96ab-93ec-746c-81d8-2cccda598203" xlink:to="loc_us-gaap_AociAttributableToNoncontrollingInterestMember_019cd0c8-9138-7d90-8e14-c0038491f704" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019c96ab-93ec-7d57-bb7e-37acf409c478" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c96ab-93ec-72a4-abc0-ea2d5afb12f5" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019c96ab-93ec-7d57-bb7e-37acf409c478" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c96ab-93ec-7a7a-bab3-96f21355d3fa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019c96ab-93ec-7d57-bb7e-37acf409c478" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c96ab-93ec-7a7a-bab3-96f21355d3fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_019c96ab-93ec-736d-90ba-944881ccf434" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019c96ab-93ec-7d57-bb7e-37acf409c478" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_019c96ab-93ec-736d-90ba-944881ccf434" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_019c96ab-93ec-7b85-8fad-c164650c0b44" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019c96ab-93ec-7d57-bb7e-37acf409c478" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_019c96ab-93ec-7b85-8fad-c164650c0b44" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019c96ab-93ec-7087-92fb-ef25e2ea74ed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019c96ab-93ec-7d57-bb7e-37acf409c478" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019c96ab-93ec-7087-92fb-ef25e2ea74ed" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019c96ab-93ec-7076-8749-6bbd7bea5cc5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.holcim.com/role/AccumulatedothercomprehensivelossScheduleofAmountsReclassifiedFromAOCItoNetLossDetails" xlink:type="simple" xlink:href="holcim-20260331.xsd#AccumulatedothercomprehensivelossScheduleofAmountsReclassifiedFromAOCItoNetLossDetails"/>
  <link:definitionLink xlink:role="http://www.holcim.com/role/AccumulatedothercomprehensivelossScheduleofAmountsReclassifiedFromAOCItoNetLossDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c96ab-93ec-7d3d-8df1-c0fe3ac7f847" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019c96ab-93ec-7ba6-923d-7e7585266a91" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c96ab-93ec-7d3d-8df1-c0fe3ac7f847" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019c96ab-93ec-7ba6-923d-7e7585266a91" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019c96ab-93ec-7552-baca-2e3f498af171" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019c96ab-93ec-7ba6-923d-7e7585266a91" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019c96ab-93ec-7552-baca-2e3f498af171" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c96ab-93ec-7552-baca-2e3f498af171_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c96ab-93ec-7552-baca-2e3f498af171" xlink:to="loc_us-gaap_EquityComponentDomain_019c96ab-93ec-7552-baca-2e3f498af171_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c96ab-93ec-7025-b5e8-27b75898c2cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c96ab-93ec-7552-baca-2e3f498af171" xlink:to="loc_us-gaap_EquityComponentDomain_019c96ab-93ec-7025-b5e8-27b75898c2cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_019c96ab-93ec-77df-a5f3-3aeedcfd8e1d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c96ab-93ec-7025-b5e8-27b75898c2cf" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_019c96ab-93ec-77df-a5f3-3aeedcfd8e1d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_019c96ab-93ec-7ab9-aff8-b96a11e1d886" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c96ab-93ec-7025-b5e8-27b75898c2cf" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_019c96ab-93ec-7ab9-aff8-b96a11e1d886" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_019c96ab-93ec-7e90-a3cf-50f73c6998c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019c96ab-93ec-7ba6-923d-7e7585266a91" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_019c96ab-93ec-7e90-a3cf-50f73c6998c2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_019c96ab-93ec-7e90-a3cf-50f73c6998c2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_019c96ab-93ec-7e90-a3cf-50f73c6998c2" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_019c96ab-93ec-7e90-a3cf-50f73c6998c2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_019c96ab-93ec-706e-9cd8-916afeb7e8d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_019c96ab-93ec-7e90-a3cf-50f73c6998c2" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_019c96ab-93ec-706e-9cd8-916afeb7e8d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_019c96ab-93ec-7cbd-87da-0e467ef1e3ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_019c96ab-93ec-706e-9cd8-916afeb7e8d9" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_019c96ab-93ec-7cbd-87da-0e467ef1e3ce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_019c96ab-93ec-7b8c-8f77-d0306185fe35" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c96ab-93ec-7d3d-8df1-c0fe3ac7f847" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_019c96ab-93ec-7b8c-8f77-d0306185fe35" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019c96ab-93ec-71d2-9730-5d908dd5cb64" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c96ab-93ec-7d3d-8df1-c0fe3ac7f847" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019c96ab-93ec-71d2-9730-5d908dd5cb64" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_019c96ab-93ec-7be2-90c0-39c2b87b1b09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c96ab-93ec-7d3d-8df1-c0fe3ac7f847" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_019c96ab-93ec-7be2-90c0-39c2b87b1b09" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019c96ab-93ec-78b6-851f-3bd7746780bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c96ab-93ec-7d3d-8df1-c0fe3ac7f847" xlink:to="loc_us-gaap_ProfitLoss_019c96ab-93ec-78b6-851f-3bd7746780bb" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.holcim.com/role/CommitmentsandcontingenciesNarrativeDetails" xlink:type="simple" xlink:href="holcim-20260331.xsd#CommitmentsandcontingenciesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.holcim.com/role/CommitmentsandcontingenciesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsLineItems_019c96ab-93ec-73c5-8968-0dfad3136376" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsTable_019c96ab-93ec-793c-859e-e48c7827e08a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019c96ab-93ec-73c5-8968-0dfad3136376" xlink:to="loc_us-gaap_OtherCommitmentsTable_019c96ab-93ec-793c-859e-e48c7827e08a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_019c96ab-93ec-74bf-aafb-8734936ae0d7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_019c96ab-93ec-793c-859e-e48c7827e08a" xlink:to="loc_us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_019c96ab-93ec-74bf-aafb-8734936ae0d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RecordedUnconditionalPurchaseObligationCategoryDomain_019c96ab-93ec-74bf-aafb-8734936ae0d7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RecordedUnconditionalPurchaseObligationCategoryDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_019c96ab-93ec-74bf-aafb-8734936ae0d7" xlink:to="loc_us-gaap_RecordedUnconditionalPurchaseObligationCategoryDomain_019c96ab-93ec-74bf-aafb-8734936ae0d7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RecordedUnconditionalPurchaseObligationCategoryDomain_019c96ab-93ec-7b8d-842b-1d390596cec3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RecordedUnconditionalPurchaseObligationCategoryDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_019c96ab-93ec-74bf-aafb-8734936ae0d7" xlink:to="loc_us-gaap_RecordedUnconditionalPurchaseObligationCategoryDomain_019c96ab-93ec-7b8d-842b-1d390596cec3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalAdditionsMember_019c96ab-93ec-77bc-8d43-c0739e95ab74" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalAdditionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RecordedUnconditionalPurchaseObligationCategoryDomain_019c96ab-93ec-7b8d-842b-1d390596cec3" xlink:to="loc_us-gaap_CapitalAdditionsMember_019c96ab-93ec-77bc-8d43-c0739e95ab74" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RecordedUnconditionalPurchaseObligation_019c96ab-93ec-7cb1-91a8-fee3dc3df7bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RecordedUnconditionalPurchaseObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019c96ab-93ec-73c5-8968-0dfad3136376" xlink:to="loc_us-gaap_RecordedUnconditionalPurchaseObligation_019c96ab-93ec-7cb1-91a8-fee3dc3df7bc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitment_019c96ab-93ec-7eed-8507-070e9337981e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019c96ab-93ec-73c5-8968-0dfad3136376" xlink:to="loc_us-gaap_OtherCommitment_019c96ab-93ec-7eed-8507-070e9337981e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccrualForEnvironmentalLossContingencies_019c96ab-93ec-7890-8dc5-f5aec159bd82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccrualForEnvironmentalLossContingencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019c96ab-93ec-73c5-8968-0dfad3136376" xlink:to="loc_us-gaap_AccrualForEnvironmentalLossContingencies_019c96ab-93ec-7890-8dc5-f5aec159bd82" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsCurrentCarryingValue_019c96ab-93ec-7841-a4c9-eeed2f1bcd7f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuaranteeObligationsCurrentCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019c96ab-93ec-73c5-8968-0dfad3136376" xlink:to="loc_us-gaap_GuaranteeObligationsCurrentCarryingValue_019c96ab-93ec-7841-a4c9-eeed2f1bcd7f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SelfInsuranceReserve_019cd0d0-4ac8-7398-bf5c-45cea35fc6a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SelfInsuranceReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019c96ab-93ec-73c5-8968-0dfad3136376" xlink:to="loc_us-gaap_SelfInsuranceReserve_019cd0d0-4ac8-7398-bf5c-45cea35fc6a7" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.holcim.com/role/RelatedpartyDetails" xlink:type="simple" xlink:href="holcim-20260331.xsd#RelatedpartyDetails"/>
  <link:definitionLink xlink:role="http://www.holcim.com/role/RelatedpartyDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019dbd15-8ea6-7848-9d9b-4b9878cc4dcb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c96ab-93ec-7265-8ace-f713c6d05784" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019dbd15-8ea6-7848-9d9b-4b9878cc4dcb" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c96ab-93ec-7265-8ace-f713c6d05784" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019dbd15-8ea6-74e4-8080-b0fd7f5ab7c7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c96ab-93ec-7265-8ace-f713c6d05784" xlink:to="loc_srt_RangeAxis_019dbd15-8ea6-74e4-8080-b0fd7f5ab7c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019dbd15-8ea6-74e4-8080-b0fd7f5ab7c7_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019dbd15-8ea6-74e4-8080-b0fd7f5ab7c7" xlink:to="loc_srt_RangeMember_019dbd15-8ea6-74e4-8080-b0fd7f5ab7c7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019dbd15-8ea6-73b9-93cf-6e954253f47b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019dbd15-8ea6-74e4-8080-b0fd7f5ab7c7" xlink:to="loc_srt_RangeMember_019dbd15-8ea6-73b9-93cf-6e954253f47b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019dbd15-8ea6-7434-812e-db84dd643da7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019dbd15-8ea6-73b9-93cf-6e954253f47b" xlink:to="loc_srt_MinimumMember_019dbd15-8ea6-7434-812e-db84dd643da7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019dbd15-8ea6-77bd-b129-a3533fd05564" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019dbd15-8ea6-73b9-93cf-6e954253f47b" xlink:to="loc_srt_MaximumMember_019dbd15-8ea6-77bd-b129-a3533fd05564" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019dbd15-8ea6-7557-8431-3edc4aa69ad4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c96ab-93ec-7265-8ace-f713c6d05784" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019dbd15-8ea6-7557-8431-3edc4aa69ad4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019dbd15-8ea6-7557-8431-3edc4aa69ad4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019dbd15-8ea6-7557-8431-3edc4aa69ad4" xlink:to="loc_us-gaap_RelatedPartyDomain_019dbd15-8ea6-7557-8431-3edc4aa69ad4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019dbd15-8ea6-7c42-9052-ba5665217f50" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019dbd15-8ea6-7557-8431-3edc4aa69ad4" xlink:to="loc_us-gaap_RelatedPartyDomain_019dbd15-8ea6-7c42-9052-ba5665217f50" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019dbd15-8ea6-71c8-93df-a5eefb14f606" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019dbd15-8ea6-7c42-9052-ba5665217f50" xlink:to="loc_us-gaap_RelatedPartyMember_019dbd15-8ea6-71c8-93df-a5eefb14f606" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvesteeMember_019dbd15-ae9e-72f9-b731-a18c336c7114" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvesteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019dbd15-8ea6-7c42-9052-ba5665217f50" xlink:to="loc_us-gaap_EquityMethodInvesteeMember_019dbd15-ae9e-72f9-b731-a18c336c7114" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_019dbd15-8ea6-705f-954e-b76ca6cad930" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019c96ab-93ec-7265-8ace-f713c6d05784" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_019dbd15-8ea6-705f-954e-b76ca6cad930" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_019dbd15-8ea6-705f-954e-b76ca6cad930_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_019dbd15-8ea6-705f-954e-b76ca6cad930" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_019dbd15-8ea6-705f-954e-b76ca6cad930_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_019dbd15-8ea6-73d9-a0c7-463a45ecc296" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_019dbd15-8ea6-705f-954e-b76ca6cad930" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_019dbd15-8ea6-73d9-a0c7-463a45ecc296" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_ProductsAndServicesPurchasedFromParentMember_019dbd15-8ea6-7881-bb1a-b79c47888300" xlink:href="holcim-20260331.xsd#holcim_ProductsAndServicesPurchasedFromParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019dbd15-8ea6-73d9-a0c7-463a45ecc296" xlink:to="loc_holcim_ProductsAndServicesPurchasedFromParentMember_019dbd15-8ea6-7881-bb1a-b79c47888300" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_RelatedPartyNotesSettledThroughDividendMember_019dbd15-cf2b-7af0-8bd3-d2b44b1b0ef4" xlink:href="holcim-20260331.xsd#holcim_RelatedPartyNotesSettledThroughDividendMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019dbd15-8ea6-73d9-a0c7-463a45ecc296" xlink:to="loc_holcim_RelatedPartyNotesSettledThroughDividendMember_019dbd15-cf2b-7af0-8bd3-d2b44b1b0ef4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_RelatedPartyNotesSettledAsEquityContributionMember_019dbd15-cf2b-7bc0-800d-4d7613a8a3a0" xlink:href="holcim-20260331.xsd#holcim_RelatedPartyNotesSettledAsEquityContributionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019dbd15-8ea6-73d9-a0c7-463a45ecc296" xlink:to="loc_holcim_RelatedPartyNotesSettledAsEquityContributionMember_019dbd15-cf2b-7bc0-800d-4d7613a8a3a0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_TransitionServicesAgreementTerm_019dbd15-8ea6-7f99-971d-c5f2aaaffc99" xlink:href="holcim-20260331.xsd#holcim_TransitionServicesAgreementTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019dbd15-8ea6-7848-9d9b-4b9878cc4dcb" xlink:to="loc_holcim_TransitionServicesAgreementTerm_019dbd15-8ea6-7f99-971d-c5f2aaaffc99" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_TaxMattersAgreementTerm_019dbd15-8ea6-7e0a-aeff-50d77242b0cd" xlink:href="holcim-20260331.xsd#holcim_TaxMattersAgreementTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019dbd15-8ea6-7848-9d9b-4b9878cc4dcb" xlink:to="loc_holcim_TaxMattersAgreementTerm_019dbd15-8ea6-7e0a-aeff-50d77242b0cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019dbd15-8ea6-723d-bcf9-9b9b5710903f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019dbd15-8ea6-7848-9d9b-4b9878cc4dcb" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019dbd15-8ea6-723d-bcf9-9b9b5710903f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_019dbd15-8ea6-7459-9e62-097b1361dfb5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019dbd15-8ea6-7848-9d9b-4b9878cc4dcb" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_019dbd15-8ea6-7459-9e62-097b1361dfb5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_ManagementCostAndCorporateSupportServicesExpense_019dbd15-ae9e-7d08-b6a7-330536976658" xlink:href="holcim-20260331.xsd#holcim_ManagementCostAndCorporateSupportServicesExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019dbd15-8ea6-7848-9d9b-4b9878cc4dcb" xlink:to="loc_holcim_ManagementCostAndCorporateSupportServicesExpense_019dbd15-ae9e-7d08-b6a7-330536976658" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019dbd15-ae9e-7d52-ab06-c52b54531b97" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019dbd15-8ea6-7848-9d9b-4b9878cc4dcb" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019dbd15-ae9e-7d52-ab06-c52b54531b97" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_019dbd15-ae9e-7dbc-86d9-817904944a77" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019dbd15-8ea6-7848-9d9b-4b9878cc4dcb" xlink:to="loc_us-gaap_InterestExpenseNonoperating_019dbd15-ae9e-7dbc-86d9-817904944a77" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInterest_019dbd15-ae9e-7066-a83e-a117d1e17d9c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentIncomeInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019dbd15-8ea6-7848-9d9b-4b9878cc4dcb" xlink:to="loc_us-gaap_InvestmentIncomeInterest_019dbd15-ae9e-7066-a83e-a117d1e17d9c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019dbd15-cf2b-7994-9c36-0d69ba518444" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019dbd15-8ea6-7848-9d9b-4b9878cc4dcb" xlink:to="loc_us-gaap_LongTermDebt_019dbd15-cf2b-7994-9c36-0d69ba518444" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAmountsOfTransaction_019dbd15-cf2b-7a0b-9e3f-f0ae958e45f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionAmountsOfTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019dbd15-8ea6-7848-9d9b-4b9878cc4dcb" xlink:to="loc_us-gaap_RelatedPartyTransactionAmountsOfTransaction_019dbd15-cf2b-7a0b-9e3f-f0ae958e45f3" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebt_019dbd15-cf2b-7eab-831b-7780271e9cdc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019dbd15-8ea6-7848-9d9b-4b9878cc4dcb" xlink:to="loc_us-gaap_InterestExpenseDebt_019dbd15-cf2b-7eab-831b-7780271e9cdc" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_TransfersToParentNet_019dbd15-cf2b-76c6-b3d5-e8c420b203bc" xlink:href="holcim-20260331.xsd#holcim_TransfersToParentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019dbd15-8ea6-7848-9d9b-4b9878cc4dcb" xlink:to="loc_holcim_TransfersToParentNet_019dbd15-cf2b-76c6-b3d5-e8c420b203bc" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_OtherNonCashActivitiesWithParentNet_019dbd15-cf2b-7bd3-97fc-c2785f23f26c" xlink:href="holcim-20260331.xsd#holcim_OtherNonCashActivitiesWithParentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019dbd15-8ea6-7848-9d9b-4b9878cc4dcb" xlink:to="loc_holcim_OtherNonCashActivitiesWithParentNet_019dbd15-cf2b-7bd3-97fc-c2785f23f26c" xlink:type="arc" order="12"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.holcim.com/role/LosspershareandshareholdersequityNarrativeDetails" xlink:type="simple" xlink:href="holcim-20260331.xsd#LosspershareandshareholdersequityNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.holcim.com/role/LosspershareandshareholdersequityNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasicLineItems_019dd245-82de-7679-98d0-92600029cc45" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareBasicLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_019c96ab-93ec-7111-824a-ed973612b9ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019dd245-82de-7679-98d0-92600029cc45" xlink:to="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_019c96ab-93ec-7111-824a-ed973612b9ce" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019dd245-a2ac-7a86-a28f-ef26ad41a259" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_019c96ab-93ec-7111-824a-ed973612b9ce" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019dd245-a2ac-7a86-a28f-ef26ad41a259" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019dd245-a2ac-7a86-a28f-ef26ad41a259_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019dd245-a2ac-7a86-a28f-ef26ad41a259" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019dd245-a2ac-7a86-a28f-ef26ad41a259_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019dd245-a2ac-7693-aeb0-1709dabf83de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019dd245-a2ac-7a86-a28f-ef26ad41a259" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019dd245-a2ac-7693-aeb0-1709dabf83de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019dd245-a2ac-7b83-b6da-b08a03ae0c15" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019dd245-a2ac-7693-aeb0-1709dabf83de" xlink:to="loc_us-gaap_SubsequentEventMember_019dd245-a2ac-7b83-b6da-b08a03ae0c15" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019dd245-82de-75ae-866b-3472e47bbb71" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019dd245-82de-7679-98d0-92600029cc45" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019dd245-82de-75ae-866b-3472e47bbb71" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019dd245-a2ac-7fa2-9c64-842727f40ef5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019dd245-82de-7679-98d0-92600029cc45" xlink:to="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019dd245-a2ac-7fa2-9c64-842727f40ef5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramPeriodInForce1_019dd245-a2ac-77ea-af17-ed499ac02b3c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchaseProgramPeriodInForce1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019dd245-82de-7679-98d0-92600029cc45" xlink:to="loc_us-gaap_StockRepurchaseProgramPeriodInForce1_019dd245-a2ac-77ea-af17-ed499ac02b3c" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.holcim.com/role/SharebasedcompensationDetails" xlink:type="simple" xlink:href="holcim-20260331.xsd#SharebasedcompensationDetails"/>
  <link:definitionLink xlink:role="http://www.holcim.com/role/SharebasedcompensationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd0e7-b767-7c12-b038-d449efc4b579" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c96ab-93ec-7031-b6d4-5721ab9c5856" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd0e7-b767-7c12-b038-d449efc4b579" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c96ab-93ec-7031-b6d4-5721ab9c5856" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019cd0e7-b767-7f47-81a4-3b7fec67aa38" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c96ab-93ec-7031-b6d4-5721ab9c5856" xlink:to="loc_us-gaap_AwardTypeAxis_019cd0e7-b767-7f47-81a4-3b7fec67aa38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd0e7-b767-7f47-81a4-3b7fec67aa38_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019cd0e7-b767-7f47-81a4-3b7fec67aa38" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd0e7-b767-7f47-81a4-3b7fec67aa38_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd0e7-b767-77ee-a749-fcf4a1db8e6a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019cd0e7-b767-7f47-81a4-3b7fec67aa38" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd0e7-b767-77ee-a749-fcf4a1db8e6a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_019cd0e7-b767-7f5b-9795-1629618f98ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cd0e7-b767-77ee-a749-fcf4a1db8e6a" xlink:to="loc_us-gaap_PerformanceSharesMember_019cd0e7-b767-7f5b-9795-1629618f98ca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019cd0e7-b767-7160-a577-cabf86089e65" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019cd0e7-b767-7c12-b038-d449efc4b579" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019cd0e7-b767-7160-a577-cabf86089e65" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.holcim.com/role/SubsequenteventsDetails" xlink:type="simple" xlink:href="holcim-20260331.xsd#SubsequenteventsDetails"/>
  <link:definitionLink xlink:role="http://www.holcim.com/role/SubsequenteventsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_019dd245-fdd2-71f4-84fc-6fd3c5625fe0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_019c96ab-93ec-7925-aad8-b135b8338126" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_019dd245-fdd2-71f4-84fc-6fd3c5625fe0" xlink:to="loc_us-gaap_SubsequentEventTable_019c96ab-93ec-7925-aad8-b135b8338126" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsAxis_019dd245-fdd1-739e-9098-d193951dd598" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_019c96ab-93ec-7925-aad8-b135b8338126" xlink:to="loc_us-gaap_DividendsAxis_019dd245-fdd1-739e-9098-d193951dd598" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsDomain_019dd245-fdd1-739e-9098-d193951dd598_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DividendsAxis_019dd245-fdd1-739e-9098-d193951dd598" xlink:to="loc_us-gaap_DividendsDomain_019dd245-fdd1-739e-9098-d193951dd598_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsDomain_019dd245-fdd1-7458-979a-9f873d61580f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DividendsAxis_019dd245-fdd1-739e-9098-d193951dd598" xlink:to="loc_us-gaap_DividendsDomain_019dd245-fdd1-7458-979a-9f873d61580f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_S2026ADividendsMember_019dd245-fdd2-7784-a63d-a4cff1e547ef" xlink:href="holcim-20260331.xsd#holcim_S2026ADividendsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DividendsDomain_019dd245-fdd1-7458-979a-9f873d61580f" xlink:to="loc_holcim_S2026ADividendsMember_019dd245-fdd2-7784-a63d-a4cff1e547ef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_O2026ADividendsMember_019dd245-fdd2-7618-8216-79331bca0989" xlink:href="holcim-20260331.xsd#holcim_O2026ADividendsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DividendsDomain_019dd245-fdd1-7458-979a-9f873d61580f" xlink:to="loc_holcim_O2026ADividendsMember_019dd245-fdd2-7618-8216-79331bca0989" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019dd245-fdd2-7293-b7be-1006e428ae2b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_019c96ab-93ec-7925-aad8-b135b8338126" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019dd245-fdd2-7293-b7be-1006e428ae2b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019dd245-fdd2-7293-b7be-1006e428ae2b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019dd245-fdd2-7293-b7be-1006e428ae2b" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019dd245-fdd2-7293-b7be-1006e428ae2b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019dd245-fdd2-7728-9906-a9d166e416c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019dd245-fdd2-7293-b7be-1006e428ae2b" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019dd245-fdd2-7728-9906-a9d166e416c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019dd245-fdd2-7229-a77c-a601d90a94bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019dd245-fdd2-7728-9906-a9d166e416c2" xlink:to="loc_us-gaap_SubsequentEventMember_019dd245-fdd2-7229-a77c-a601d90a94bb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_019dd245-fdd2-7c29-9b23-30eecf116ac7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_019c96ab-93ec-7925-aad8-b135b8338126" xlink:to="loc_srt_StatementScenarioAxis_019dd245-fdd2-7c29-9b23-30eecf116ac7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019dd245-fdd2-7c29-9b23-30eecf116ac7_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_019dd245-fdd2-7c29-9b23-30eecf116ac7" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019dd245-fdd2-7c29-9b23-30eecf116ac7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019dd245-fdd2-714a-a82f-bff6c5da07bf" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_019dd245-fdd2-7c29-9b23-30eecf116ac7" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019dd245-fdd2-714a-a82f-bff6c5da07bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_019dd245-fdd2-7a71-83c2-f9378d89002f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_019dd245-fdd2-714a-a82f-bff6c5da07bf" xlink:to="loc_srt_ScenarioForecastMember_019dd245-fdd2-7a71-83c2-f9378d89002f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_019dd245-fdd2-73f2-817b-7d89a64418e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockDividendsPerShareDeclared"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019dd245-fdd2-71f4-84fc-6fd3c5625fe0" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_019dd245-fdd2-73f2-817b-7d89a64418e5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_holcim_DividendsDeclaredNumberOfInstallments_019dd469-8ded-7749-89eb-d81253e5e6c5" xlink:href="holcim-20260331.xsd#holcim_DividendsDeclaredNumberOfInstallments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019dd245-fdd2-71f4-84fc-6fd3c5625fe0" xlink:to="loc_holcim_DividendsDeclaredNumberOfInstallments_019dd469-8ded-7749-89eb-d81253e5e6c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableAmountPerShare_019dd972-5dad-7cc0-9f80-0e735108aefa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsPayableAmountPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019dd245-fdd2-71f4-84fc-6fd3c5625fe0" xlink:to="loc_us-gaap_DividendsPayableAmountPerShare_019dd972-5dad-7cc0-9f80-0e735108aefa" xlink:type="arc" order="2"/>
  </link:definitionLink>
</link:linkbase>
