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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2024 Workiva-->
<!--r:5c1832ed-cb7c-4114-998a-24afa80fe3ad,g:1e23bc1e-983c-4a26-bb3c-adac57f57970-->
<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://cannabistcompany.com/role/CONDENSEDCONSOLIDATEDINTERIMSTATEMENTSOFCHANGESINEQUITY" xlink:type="simple" xlink:href="cbstf-20240930.xsd#CONDENSEDCONSOLIDATEDINTERIMSTATEMENTSOFCHANGESINEQUITY"/>
  <link:definitionLink xlink:role="http://cannabistcompany.com/role/CONDENSEDCONSOLIDATEDINTERIMSTATEMENTSOFCHANGESINEQUITY" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_062522d5-0d2f-4ea2-8ed8-0e3ef7020a18" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_b8c9f289-8c33-45ea-aa62-3b2cec3fe3fa" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_062522d5-0d2f-4ea2-8ed8-0e3ef7020a18" xlink:to="loc_us-gaap_StatementTable_b8c9f289-8c33-45ea-aa62-3b2cec3fe3fa" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_134c60fd-0b9d-47d1-990d-b4fe778259dc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_b8c9f289-8c33-45ea-aa62-3b2cec3fe3fa" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_134c60fd-0b9d-47d1-990d-b4fe778259dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_134c60fd-0b9d-47d1-990d-b4fe778259dc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_134c60fd-0b9d-47d1-990d-b4fe778259dc" xlink:to="loc_us-gaap_EquityComponentDomain_134c60fd-0b9d-47d1-990d-b4fe778259dc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_19e5379b-b251-450f-a2bb-f81599472db8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_134c60fd-0b9d-47d1-990d-b4fe778259dc" xlink:to="loc_us-gaap_EquityComponentDomain_19e5379b-b251-450f-a2bb-f81599472db8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ParentMember_9ef868ef-69aa-438f-b098-0648cc7886b2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_19e5379b-b251-450f-a2bb-f81599472db8" xlink:to="loc_us-gaap_ParentMember_9ef868ef-69aa-438f-b098-0648cc7886b2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_e1fa643f-a846-4e05-a9e9-d6dc83e06005" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_9ef868ef-69aa-438f-b098-0648cc7886b2" xlink:to="loc_us-gaap_CommonStockMember_e1fa643f-a846-4e05-a9e9-d6dc83e06005" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_ProportionateVotingSharesMember_aaf1ef9c-fba1-4c26-a0e0-390195b6cd9f" xlink:href="cbstf-20240930.xsd#cbstf_ProportionateVotingSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_9ef868ef-69aa-438f-b098-0648cc7886b2" xlink:to="loc_cbstf_ProportionateVotingSharesMember_aaf1ef9c-fba1-4c26-a0e0-390195b6cd9f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_1dac3d8a-e18e-4c1b-9291-b6bb2a5c45e9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_9ef868ef-69aa-438f-b098-0648cc7886b2" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_1dac3d8a-e18e-4c1b-9291-b6bb2a5c45e9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_5f1ee027-821c-477a-aa2e-0d1b048046a8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_9ef868ef-69aa-438f-b098-0648cc7886b2" xlink:to="loc_us-gaap_RetainedEarningsMember_5f1ee027-821c-477a-aa2e-0d1b048046a8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_c17b6e8d-17e9-4e57-a753-4bb87801369d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_19e5379b-b251-450f-a2bb-f81599472db8" xlink:to="loc_us-gaap_NoncontrollingInterestMember_c17b6e8d-17e9-4e57-a753-4bb87801369d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_961e337f-0dff-41e9-8575-1e53bd4b2463" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_062522d5-0d2f-4ea2-8ed8-0e3ef7020a18" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_961e337f-0dff-41e9-8575-1e53bd4b2463" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_e5b18a14-495f-40f1-b6e6-267d7988556e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_961e337f-0dff-41e9-8575-1e53bd4b2463" xlink:to="loc_us-gaap_SharesOutstanding_e5b18a14-495f-40f1-b6e6-267d7988556e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_2ac1ca53-b76a-401b-bbfc-f36c3558998d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_961e337f-0dff-41e9-8575-1e53bd4b2463" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_2ac1ca53-b76a-401b-bbfc-f36c3558998d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_fb1225e2-50d0-4592-9829-daca75b38d55" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_961e337f-0dff-41e9-8575-1e53bd4b2463" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_fb1225e2-50d0-4592-9829-daca75b38d55" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_60f8e52a-df0b-4c21-977d-44e2a3e18925" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_961e337f-0dff-41e9-8575-1e53bd4b2463" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_60f8e52a-df0b-4c21-977d-44e2a3e18925" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits_3905fa84-acab-419a-a7d6-23278ecba4c6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_961e337f-0dff-41e9-8575-1e53bd4b2463" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits_3905fa84-acab-419a-a7d6-23278ecba4c6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfUnits_161c98a1-bb38-4a51-8341-3cb1734d85e1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodValueConversionOfUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_961e337f-0dff-41e9-8575-1e53bd4b2463" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfUnits_161c98a1-bb38-4a51-8341-3cb1734d85e1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_40c0f8ab-4750-4b47-a04d-f567eb7440f7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_961e337f-0dff-41e9-8575-1e53bd4b2463" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_40c0f8ab-4750-4b47-a04d-f567eb7440f7" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesIssuedForServices_1b1c4d4c-2708-4973-8e60-273e5d035a71" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodSharesIssuedForServices"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_961e337f-0dff-41e9-8575-1e53bd4b2463" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesIssuedForServices_1b1c4d4c-2708-4973-8e60-273e5d035a71" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueIssuedForServices_ed4573eb-1322-4c7a-95f9-8cb4e27e1b59" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodValueIssuedForServices"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_961e337f-0dff-41e9-8575-1e53bd4b2463" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueIssuedForServices_ed4573eb-1322-4c7a-95f9-8cb4e27e1b59" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_NoncontrollingInterestIncreaseDecreaseFromDeconsolidation_6991c9a2-144a-4d5b-85a4-be729229252c" xlink:href="cbstf-20240930.xsd#cbstf_NoncontrollingInterestIncreaseDecreaseFromDeconsolidation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_961e337f-0dff-41e9-8575-1e53bd4b2463" xlink:to="loc_cbstf_NoncontrollingInterestIncreaseDecreaseFromDeconsolidation_6991c9a2-144a-4d5b-85a4-be729229252c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_adc22900-d4b9-4511-a311-e380bb34bf10" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_961e337f-0dff-41e9-8575-1e53bd4b2463" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_adc22900-d4b9-4511-a311-e380bb34bf10" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_c2270cf4-7b1a-4d19-aea8-3796a1d4ac8d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_961e337f-0dff-41e9-8575-1e53bd4b2463" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_c2270cf4-7b1a-4d19-aea8-3796a1d4ac8d" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_5032a3d1-195f-46bc-b6a0-b753201edc93" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_961e337f-0dff-41e9-8575-1e53bd4b2463" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_5032a3d1-195f-46bc-b6a0-b753201edc93" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_d46c11fd-952b-4203-8b1d-6d649bab7549" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_961e337f-0dff-41e9-8575-1e53bd4b2463" xlink:to="loc_us-gaap_ProfitLoss_d46c11fd-952b-4203-8b1d-6d649bab7549" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_4d32a693-5131-4243-9899-ba0bf32265cc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_46d7a38e-a5b5-45a3-a5c5-0022a39b6f4b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SharesOutstanding"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://cannabistcompany.com/role/SummaryofSignificantAccountingPoliciesScheduleofRevenuesDisaggregatedDetails" xlink:type="simple" xlink:href="cbstf-20240930.xsd#SummaryofSignificantAccountingPoliciesScheduleofRevenuesDisaggregatedDetails"/>
  <link:definitionLink xlink:role="http://cannabistcompany.com/role/SummaryofSignificantAccountingPoliciesScheduleofRevenuesDisaggregatedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_c33c987b-e818-4514-b148-570ee419d3f2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_44a07454-ca6c-4e0b-bca6-fad0ca76aabd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_c33c987b-e818-4514-b148-570ee419d3f2" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_44a07454-ca6c-4e0b-bca6-fad0ca76aabd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_429270c2-1c71-4d01-a88e-e01090e6c483" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_44a07454-ca6c-4e0b-bca6-fad0ca76aabd" xlink:to="loc_srt_ProductOrServiceAxis_429270c2-1c71-4d01-a88e-e01090e6c483" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_429270c2-1c71-4d01-a88e-e01090e6c483_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_429270c2-1c71-4d01-a88e-e01090e6c483" xlink:to="loc_srt_ProductsAndServicesDomain_429270c2-1c71-4d01-a88e-e01090e6c483_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_1a7bfe7a-9694-410b-bcc7-7c204a3734ee" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_429270c2-1c71-4d01-a88e-e01090e6c483" xlink:to="loc_srt_ProductsAndServicesDomain_1a7bfe7a-9694-410b-bcc7-7c204a3734ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_DispensaryMember_761fcc44-36ad-4cb9-bd4d-370030426904" xlink:href="cbstf-20240930.xsd#cbstf_DispensaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_1a7bfe7a-9694-410b-bcc7-7c204a3734ee" xlink:to="loc_cbstf_DispensaryMember_761fcc44-36ad-4cb9-bd4d-370030426904" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_CultivationAndWholesaleMember_76ae4588-6f1b-412c-abf3-af255cf5716e" xlink:href="cbstf-20240930.xsd#cbstf_CultivationAndWholesaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_1a7bfe7a-9694-410b-bcc7-7c204a3734ee" xlink:to="loc_cbstf_CultivationAndWholesaleMember_76ae4588-6f1b-412c-abf3-af255cf5716e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ManufacturedProductOtherMember_4782bfa3-e07c-42bb-9bd1-ed91898f512d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ManufacturedProductOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_1a7bfe7a-9694-410b-bcc7-7c204a3734ee" xlink:to="loc_us-gaap_ManufacturedProductOtherMember_4782bfa3-e07c-42bb-9bd1-ed91898f512d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_783d0c64-9004-4163-be68-07e6279fd800" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_c33c987b-e818-4514-b148-570ee419d3f2" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_783d0c64-9004-4163-be68-07e6279fd800" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://cannabistcompany.com/role/CurrentandLongTermDebtScheduleofCurrentandLongTermObligationsNetDetails" xlink:type="simple" xlink:href="cbstf-20240930.xsd#CurrentandLongTermDebtScheduleofCurrentandLongTermObligationsNetDetails"/>
  <link:definitionLink xlink:role="http://cannabistcompany.com/role/CurrentandLongTermDebtScheduleofCurrentandLongTermObligationsNetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_31ff0274-fb0e-4d07-90bf-7b7d5f89683c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_cb9139bb-a720-4116-8dc9-ba6310655ce8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_31ff0274-fb0e-4d07-90bf-7b7d5f89683c" xlink:to="loc_us-gaap_DebtInstrumentTable_cb9139bb-a720-4116-8dc9-ba6310655ce8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_130cf551-cbe7-4283-a4b5-6ca59e3960b2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_cb9139bb-a720-4116-8dc9-ba6310655ce8" xlink:to="loc_us-gaap_DebtInstrumentAxis_130cf551-cbe7-4283-a4b5-6ca59e3960b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_130cf551-cbe7-4283-a4b5-6ca59e3960b2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_130cf551-cbe7-4283-a4b5-6ca59e3960b2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_130cf551-cbe7-4283-a4b5-6ca59e3960b2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_46e3f26d-287f-4d9e-818e-d2b14420eb56" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_130cf551-cbe7-4283-a4b5-6ca59e3960b2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_46e3f26d-287f-4d9e-818e-d2b14420eb56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_TwentyTwentySixNotesMember_5242c189-1ebf-4dac-b9cc-1d74f6e204b3" xlink:href="cbstf-20240930.xsd#cbstf_TwentyTwentySixNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_46e3f26d-287f-4d9e-818e-d2b14420eb56" xlink:to="loc_cbstf_TwentyTwentySixNotesMember_5242c189-1ebf-4dac-b9cc-1d74f6e204b3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_TwentyTwentyFourNotesMember_fbeb0426-9e2f-4a36-974d-c2c15df566fa" xlink:href="cbstf-20240930.xsd#cbstf_TwentyTwentyFourNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_46e3f26d-287f-4d9e-818e-d2b14420eb56" xlink:to="loc_cbstf_TwentyTwentyFourNotesMember_fbeb0426-9e2f-4a36-974d-c2c15df566fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_TwentyTwentySevenConvertibleNotesMember_5e1238a6-9418-45f0-84bd-f42c6f64a4db" xlink:href="cbstf-20240930.xsd#cbstf_TwentyTwentySevenConvertibleNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_46e3f26d-287f-4d9e-818e-d2b14420eb56" xlink:to="loc_cbstf_TwentyTwentySevenConvertibleNotesMember_5e1238a6-9418-45f0-84bd-f42c6f64a4db" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_TwentyTwentyFiveConvertibleNotesMember_f70e69d2-39bd-4f07-984e-9c27a3ce901a" xlink:href="cbstf-20240930.xsd#cbstf_TwentyTwentyFiveConvertibleNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_46e3f26d-287f-4d9e-818e-d2b14420eb56" xlink:to="loc_cbstf_TwentyTwentyFiveConvertibleNotesMember_f70e69d2-39bd-4f07-984e-9c27a3ce901a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_MortgageNotesMember_471e2a57-0350-402d-af59-9ed3d39f26c3" xlink:href="cbstf-20240930.xsd#cbstf_MortgageNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_46e3f26d-287f-4d9e-818e-d2b14420eb56" xlink:to="loc_cbstf_MortgageNotesMember_471e2a57-0350-402d-af59-9ed3d39f26c3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_AcquisitionRelatedPromissoryNotesMember_dca178c7-d5b1-4644-9d35-d688dfae57a4" xlink:href="cbstf-20240930.xsd#cbstf_AcquisitionRelatedPromissoryNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_46e3f26d-287f-4d9e-818e-d2b14420eb56" xlink:to="loc_cbstf_AcquisitionRelatedPromissoryNotesMember_dca178c7-d5b1-4644-9d35-d688dfae57a4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_33c028e0-dc3b-4708-8c21-5630094ba13b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_31ff0274-fb0e-4d07-90bf-7b7d5f89683c" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_33c028e0-dc3b-4708-8c21-5630094ba13b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_2089955c-d12e-4ffc-b436-554cf55bbdbc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentUnamortizedDiscount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_31ff0274-fb0e-4d07-90bf-7b7d5f89683c" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_2089955c-d12e-4ffc-b436-554cf55bbdbc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsGross_ad1bd996-f522-4ca8-a966-787c1dea5c5e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DeferredFinanceCostsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_31ff0274-fb0e-4d07-90bf-7b7d5f89683c" xlink:to="loc_us-gaap_DeferredFinanceCostsGross_ad1bd996-f522-4ca8-a966-787c1dea5c5e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_c570ca45-315e-42da-9b32-c5e71dd6a6bc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_31ff0274-fb0e-4d07-90bf-7b7d5f89683c" xlink:to="loc_us-gaap_LongTermDebt_c570ca45-315e-42da-9b32-c5e71dd6a6bc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_0c07c636-b245-44ab-9e32-7b4386b0a638" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_31ff0274-fb0e-4d07-90bf-7b7d5f89683c" xlink:to="loc_us-gaap_LongTermDebtCurrent_0c07c636-b245-44ab-9e32-7b4386b0a638" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_dbfa031d-a268-4ee2-bf7f-254af510551d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_31ff0274-fb0e-4d07-90bf-7b7d5f89683c" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_dbfa031d-a268-4ee2-bf7f-254af510551d" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://cannabistcompany.com/role/CurrentandLongTermDebtAdditionalInformationDetails" xlink:type="simple" xlink:href="cbstf-20240930.xsd#CurrentandLongTermDebtAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://cannabistcompany.com/role/CurrentandLongTermDebtAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:href="cbstf-20240930.xsd#cbstf_DebtDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_DebtDisclosureTable_c8ed6935-f1cf-4dd0-898f-05227efd015b" xlink:href="cbstf-20240930.xsd#cbstf_DebtDisclosureTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_cbstf_DebtDisclosureTable_c8ed6935-f1cf-4dd0-898f-05227efd015b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_d0eef27f-53eb-4fee-8a94-3f11e8689b3d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cbstf_DebtDisclosureTable_c8ed6935-f1cf-4dd0-898f-05227efd015b" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_d0eef27f-53eb-4fee-8a94-3f11e8689b3d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_d0eef27f-53eb-4fee-8a94-3f11e8689b3d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_d0eef27f-53eb-4fee-8a94-3f11e8689b3d" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_d0eef27f-53eb-4fee-8a94-3f11e8689b3d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_7e42a7a9-0c97-46f3-86d2-4d05cfa11b39" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_d0eef27f-53eb-4fee-8a94-3f11e8689b3d" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_7e42a7a9-0c97-46f3-86d2-4d05cfa11b39" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrivatePlacementMember_16344871-eb81-4a53-9bda-6c7fd25d7023" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PrivatePlacementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_7e42a7a9-0c97-46f3-86d2-4d05cfa11b39" xlink:to="loc_us-gaap_PrivatePlacementMember_16344871-eb81-4a53-9bda-6c7fd25d7023" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_745ad3bd-8732-4880-ac5b-2d231dc018aa" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cbstf_DebtDisclosureTable_c8ed6935-f1cf-4dd0-898f-05227efd015b" xlink:to="loc_us-gaap_DebtInstrumentAxis_745ad3bd-8732-4880-ac5b-2d231dc018aa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_745ad3bd-8732-4880-ac5b-2d231dc018aa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_745ad3bd-8732-4880-ac5b-2d231dc018aa" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_745ad3bd-8732-4880-ac5b-2d231dc018aa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_4b28d2ce-e014-42a4-9c1d-b4b1e44d6a3a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_745ad3bd-8732-4880-ac5b-2d231dc018aa" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_4b28d2ce-e014-42a4-9c1d-b4b1e44d6a3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_TwentyTwentySixDebtMember_31044549-dfd4-464e-8669-8f2ba73b7522" xlink:href="cbstf-20240930.xsd#cbstf_TwentyTwentySixDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_4b28d2ce-e014-42a4-9c1d-b4b1e44d6a3a" xlink:to="loc_cbstf_TwentyTwentySixDebtMember_31044549-dfd4-464e-8669-8f2ba73b7522" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_ThirteenNotesDueMayTwoThousandTwentyFourMember_9dea9573-02c6-4bd8-8b44-9e524ca61b3e" xlink:href="cbstf-20240930.xsd#cbstf_ThirteenNotesDueMayTwoThousandTwentyFourMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_4b28d2ce-e014-42a4-9c1d-b4b1e44d6a3a" xlink:to="loc_cbstf_ThirteenNotesDueMayTwoThousandTwentyFourMember_9dea9573-02c6-4bd8-8b44-9e524ca61b3e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_TwentyTwentyFourDebtMember_7f7c9f11-7b93-44ca-98e9-f8c09418e935" xlink:href="cbstf-20240930.xsd#cbstf_TwentyTwentyFourDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_4b28d2ce-e014-42a4-9c1d-b4b1e44d6a3a" xlink:to="loc_cbstf_TwentyTwentyFourDebtMember_7f7c9f11-7b93-44ca-98e9-f8c09418e935" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_TwentyTwentySevenConvertibleNotesMember_b930ab9d-c5aa-4367-8164-df46215200a2" xlink:href="cbstf-20240930.xsd#cbstf_TwentyTwentySevenConvertibleNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_4b28d2ce-e014-42a4-9c1d-b4b1e44d6a3a" xlink:to="loc_cbstf_TwentyTwentySevenConvertibleNotesMember_b930ab9d-c5aa-4367-8164-df46215200a2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_TwentyTwentyFiveConvertibleNotesMember_f0ff4891-ef81-4676-acb5-55695e6a8d83" xlink:href="cbstf-20240930.xsd#cbstf_TwentyTwentyFiveConvertibleNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_4b28d2ce-e014-42a4-9c1d-b4b1e44d6a3a" xlink:to="loc_cbstf_TwentyTwentyFiveConvertibleNotesMember_f0ff4891-ef81-4676-acb5-55695e6a8d83" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgagesMember_ba1b96cb-124b-469d-8c7e-61c57af3b8d3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_MortgagesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_4b28d2ce-e014-42a4-9c1d-b4b1e44d6a3a" xlink:to="loc_us-gaap_MortgagesMember_ba1b96cb-124b-469d-8c7e-61c57af3b8d3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionTypeAxis_4968aa19-6d11-4173-951c-dce9893b3e6b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TransactionTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cbstf_DebtDisclosureTable_c8ed6935-f1cf-4dd0-898f-05227efd015b" xlink:to="loc_us-gaap_TransactionTypeAxis_4968aa19-6d11-4173-951c-dce9893b3e6b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionDomain_4968aa19-6d11-4173-951c-dce9893b3e6b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TransactionTypeAxis_4968aa19-6d11-4173-951c-dce9893b3e6b" xlink:to="loc_us-gaap_TransactionDomain_4968aa19-6d11-4173-951c-dce9893b3e6b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionDomain_5e4beff4-0624-4c68-978a-538b96e9315a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TransactionTypeAxis_4968aa19-6d11-4173-951c-dce9893b3e6b" xlink:to="loc_us-gaap_TransactionDomain_5e4beff4-0624-4c68-978a-538b96e9315a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_ExchangeAgreementMember_a15b6a18-b7e8-4bbf-b9ba-345c329a09df" xlink:href="cbstf-20240930.xsd#cbstf_ExchangeAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransactionDomain_5e4beff4-0624-4c68-978a-538b96e9315a" xlink:to="loc_cbstf_ExchangeAgreementMember_a15b6a18-b7e8-4bbf-b9ba-345c329a09df" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_3a26a3ea-265d-4c99-8d51-65ab40249bfc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cbstf_DebtDisclosureTable_c8ed6935-f1cf-4dd0-898f-05227efd015b" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_3a26a3ea-265d-4c99-8d51-65ab40249bfc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_3a26a3ea-265d-4c99-8d51-65ab40249bfc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_3a26a3ea-265d-4c99-8d51-65ab40249bfc" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_3a26a3ea-265d-4c99-8d51-65ab40249bfc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_82e4c659-00d7-4dd9-b336-fdc0924082db" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_3a26a3ea-265d-4c99-8d51-65ab40249bfc" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_82e4c659-00d7-4dd9-b336-fdc0924082db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_DebtModificationMember_62df707f-ebf9-4ef8-b725-1303b67e57f0" xlink:href="cbstf-20240930.xsd#cbstf_DebtModificationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_82e4c659-00d7-4dd9-b336-fdc0924082db" xlink:to="loc_cbstf_DebtModificationMember_62df707f-ebf9-4ef8-b725-1303b67e57f0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_c6d1a1c2-b4d4-4eb3-92b1-623d235494ee" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_82e4c659-00d7-4dd9-b336-fdc0924082db" xlink:to="loc_us-gaap_ConvertibleDebtMember_c6d1a1c2-b4d4-4eb3-92b1-623d235494ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_a03a0ddd-74ec-4b03-a4e4-158029ec5fe6" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cbstf_DebtDisclosureTable_c8ed6935-f1cf-4dd0-898f-05227efd015b" xlink:to="loc_srt_StatementGeographicalAxis_a03a0ddd-74ec-4b03-a4e4-158029ec5fe6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_a03a0ddd-74ec-4b03-a4e4-158029ec5fe6_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_a03a0ddd-74ec-4b03-a4e4-158029ec5fe6" xlink:to="loc_srt_SegmentGeographicalDomain_a03a0ddd-74ec-4b03-a4e4-158029ec5fe6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_14eb7a53-1abb-4129-9e7f-55793db5c5d3" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_a03a0ddd-74ec-4b03-a4e4-158029ec5fe6" xlink:to="loc_srt_SegmentGeographicalDomain_14eb7a53-1abb-4129-9e7f-55793db5c5d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_NY_8f058758-0e8b-49ad-ad3f-477b75883e90" xlink:href="https://xbrl.sec.gov/stpr/2024/stpr-2024.xsd#stpr_NY"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_14eb7a53-1abb-4129-9e7f-55793db5c5d3" xlink:to="loc_stpr_NY_8f058758-0e8b-49ad-ad3f-477b75883e90" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_NJ_71ac289b-3f2f-49e4-89a7-159b875dd516" xlink:href="https://xbrl.sec.gov/stpr/2024/stpr-2024.xsd#stpr_NJ"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_14eb7a53-1abb-4129-9e7f-55793db5c5d3" xlink:to="loc_stpr_NJ_71ac289b-3f2f-49e4-89a7-159b875dd516" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_MD_feb301e5-09c3-4873-b0fb-2842380c1791" xlink:href="https://xbrl.sec.gov/stpr/2024/stpr-2024.xsd#stpr_MD"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_14eb7a53-1abb-4129-9e7f-55793db5c5d3" xlink:to="loc_stpr_MD_feb301e5-09c3-4873-b0fb-2842380c1791" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_DE_7011ad89-c30c-4312-9e60-97ab78ab14ef" xlink:href="https://xbrl.sec.gov/stpr/2024/stpr-2024.xsd#stpr_DE"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_14eb7a53-1abb-4129-9e7f-55793db5c5d3" xlink:to="loc_stpr_DE_7011ad89-c30c-4312-9e60-97ab78ab14ef" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfArrangementAxis_4dd13b90-4b0e-4c3f-9c65-b52020cc3bbf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TypeOfArrangementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cbstf_DebtDisclosureTable_c8ed6935-f1cf-4dd0-898f-05227efd015b" xlink:to="loc_us-gaap_TypeOfArrangementAxis_4dd13b90-4b0e-4c3f-9c65-b52020cc3bbf" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_4dd13b90-4b0e-4c3f-9c65-b52020cc3bbf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TypeOfArrangementAxis_4dd13b90-4b0e-4c3f-9c65-b52020cc3bbf" xlink:to="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_4dd13b90-4b0e-4c3f-9c65-b52020cc3bbf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_d668368f-3e6b-41bf-837a-3a8b75a62846" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TypeOfArrangementAxis_4dd13b90-4b0e-4c3f-9c65-b52020cc3bbf" xlink:to="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_d668368f-3e6b-41bf-837a-3a8b75a62846" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_FirstAgreementMember_fcaa7f7d-0b89-43ae-9943-7839e7b409c6" xlink:href="cbstf-20240930.xsd#cbstf_FirstAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_d668368f-3e6b-41bf-837a-3a8b75a62846" xlink:to="loc_cbstf_FirstAgreementMember_fcaa7f7d-0b89-43ae-9943-7839e7b409c6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_SecondAgreementMember_36cf60e8-ff4d-4fd5-96cb-c8d1fe907155" xlink:href="cbstf-20240930.xsd#cbstf_SecondAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_d668368f-3e6b-41bf-837a-3a8b75a62846" xlink:to="loc_cbstf_SecondAgreementMember_36cf60e8-ff4d-4fd5-96cb-c8d1fe907155" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_289da95e-3191-439c-8e78-9fe2dad4f6f2" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cbstf_DebtDisclosureTable_c8ed6935-f1cf-4dd0-898f-05227efd015b" xlink:to="loc_srt_RangeAxis_289da95e-3191-439c-8e78-9fe2dad4f6f2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_289da95e-3191-439c-8e78-9fe2dad4f6f2_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_289da95e-3191-439c-8e78-9fe2dad4f6f2" xlink:to="loc_srt_RangeMember_289da95e-3191-439c-8e78-9fe2dad4f6f2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_660ac360-bbe3-470a-82fa-08ab188bf09a" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_289da95e-3191-439c-8e78-9fe2dad4f6f2" xlink:to="loc_srt_RangeMember_660ac360-bbe3-470a-82fa-08ab188bf09a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_f7b999c3-fb02-4a54-a9fe-d30fc98d401d" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_660ac360-bbe3-470a-82fa-08ab188bf09a" xlink:to="loc_srt_MinimumMember_f7b999c3-fb02-4a54-a9fe-d30fc98d401d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_863a2959-c5cd-48e3-a148-cd3694401b61" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_660ac360-bbe3-470a-82fa-08ab188bf09a" xlink:to="loc_srt_MaximumMember_863a2959-c5cd-48e3-a148-cd3694401b61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_cb6b3b94-d633-4887-8549-c9a08e74aae3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentRedemptionPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cbstf_DebtDisclosureTable_c8ed6935-f1cf-4dd0-898f-05227efd015b" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_cb6b3b94-d633-4887-8549-c9a08e74aae3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_cb6b3b94-d633-4887-8549-c9a08e74aae3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_cb6b3b94-d633-4887-8549-c9a08e74aae3" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_cb6b3b94-d633-4887-8549-c9a08e74aae3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_545fa7af-d1bd-411d-b1e2-b36936a2ff35" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_cb6b3b94-d633-4887-8549-c9a08e74aae3" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_545fa7af-d1bd-411d-b1e2-b36936a2ff35" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_1e6e6f10-9ff8-4967-88c8-4158a3433761" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentRedemptionPeriodOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_545fa7af-d1bd-411d-b1e2-b36936a2ff35" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_1e6e6f10-9ff8-4967-88c8-4158a3433761" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_15d4216b-8904-4a6b-bc49-3276e56dc5d9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentRedemptionPeriodTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_545fa7af-d1bd-411d-b1e2-b36936a2ff35" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_15d4216b-8904-4a6b-bc49-3276e56dc5d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_d872ac45-120a-4a1f-a97f-77cb36e97fa5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentRedemptionPeriodThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_545fa7af-d1bd-411d-b1e2-b36936a2ff35" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_d872ac45-120a-4a1f-a97f-77cb36e97fa5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_DebtInstrumentRedemptionPeriodsOneAndTwoMemberMember_4aa40a17-f581-42f9-b6ee-88db9a1ebded" xlink:href="cbstf-20240930.xsd#cbstf_DebtInstrumentRedemptionPeriodsOneAndTwoMemberMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_545fa7af-d1bd-411d-b1e2-b36936a2ff35" xlink:to="loc_cbstf_DebtInstrumentRedemptionPeriodsOneAndTwoMemberMember_4aa40a17-f581-42f9-b6ee-88db9a1ebded" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_1838e572-a841-4b51-be89-34a2657d7082" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_1838e572-a841-4b51-be89-34a2657d7082" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_c9fa6972-3746-401c-ab5b-4a833d39fc30" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_c9fa6972-3746-401c-ab5b-4a833d39fc30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt_3c398239-2807-49fa-8f23-2936a99ecac8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt_3c398239-2807-49fa-8f23-2936a99ecac8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_PercentageOfDebtIssued_5acc55df-04e7-4696-8e11-1224b65171a4" xlink:href="cbstf-20240930.xsd#cbstf_PercentageOfDebtIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_cbstf_PercentageOfDebtIssued_5acc55df-04e7-4696-8e11-1224b65171a4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_DebtExchange_2c656aae-8180-49db-afe6-7f7db4af34a8" xlink:href="cbstf-20240930.xsd#cbstf_DebtExchange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_cbstf_DebtExchange_2c656aae-8180-49db-afe6-7f7db4af34a8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_UnamortizedDebtDiscountAndIssuanceCosts_9f297263-b58a-448a-9207-59b27aa12741" xlink:href="cbstf-20240930.xsd#cbstf_UnamortizedDebtDiscountAndIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_cbstf_UnamortizedDebtDiscountAndIssuanceCosts_9f297263-b58a-448a-9207-59b27aa12741" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_CreditorFees_5512219b-8e69-4df9-8a61-8a1aec10d9fe" xlink:href="cbstf-20240930.xsd#cbstf_CreditorFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_cbstf_CreditorFees_5512219b-8e69-4df9-8a61-8a1aec10d9fe" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LegalFees_e06f183d-521c-49d8-9e40-2cce635a9867" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LegalFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_us-gaap_LegalFees_e06f183d-521c-49d8-9e40-2cce635a9867" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReduction_d690a5ed-2ea1-4424-93fd-aaf27931befc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NotesReduction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_us-gaap_NotesReduction_d690a5ed-2ea1-4424-93fd-aaf27931befc" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfFinancingCosts_ce7923e4-f50b-4a2e-a33c-7a79d10cf9a3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsOfFinancingCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_us-gaap_PaymentsOfFinancingCosts_ce7923e4-f50b-4a2e-a33c-7a79d10cf9a3" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits_49a77276-5333-4490-bf05-60eb218d6fdf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits_49a77276-5333-4490-bf05-60eb218d6fdf" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebt_812a91f1-120f-4299-af3a-51b984be904e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ConvertibleDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_us-gaap_ConvertibleDebt_812a91f1-120f-4299-af3a-51b984be904e" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilitiesNoncurrent_22725a62-5432-4682-8897-de60b21fc78e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_us-gaap_DerivativeLiabilitiesNoncurrent_22725a62-5432-4682-8897-de60b21fc78e" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnamortizedDebtIssuanceExpense_0af80fa2-14c7-4aeb-969f-8e5d5293b09d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_UnamortizedDebtIssuanceExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_us-gaap_UnamortizedDebtIssuanceExpense_0af80fa2-14c7-4aeb-969f-8e5d5293b09d" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_DebtInstrumentConvertibleDaysPriorToMaturityDate_c0bfc537-1079-4a1f-b492-f4137497ec3b" xlink:href="cbstf-20240930.xsd#cbstf_DebtInstrumentConvertibleDaysPriorToMaturityDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_cbstf_DebtInstrumentConvertibleDaysPriorToMaturityDate_c0bfc537-1079-4a1f-b492-f4137497ec3b" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_87256d0c-f755-4bcd-8e80-6315a77f6664" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentConvertibleConversionPrice1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_87256d0c-f755-4bcd-8e80-6315a77f6664" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_9038d14f-5b21-4167-b661-fde3aa44a172" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_9038d14f-5b21-4167-b661-fde3aa44a172" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_baec1e22-9bed-4b3d-90cb-225f83fcb2a9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_baec1e22-9bed-4b3d-90cb-225f83fcb2a9" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability_d82e86df-92aa-49eb-a384-b86a6f9fa68f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability_d82e86df-92aa-49eb-a384-b86a6f9fa68f" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_f2ab7701-1ccf-4a85-a061-0b922e6649ce" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentRepurchasedFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_f2ab7701-1ccf-4a85-a061-0b922e6649ce" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_DiscountOnWeightedAveragePriceOfCommonShares_8ec03ab8-c46f-412c-82f2-e95cdb7d5776" xlink:href="cbstf-20240930.xsd#cbstf_DiscountOnWeightedAveragePriceOfCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_cbstf_DiscountOnWeightedAveragePriceOfCommonShares_8ec03ab8-c46f-412c-82f2-e95cdb7d5776" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_c863a1b6-fe3a-479f-9a5d-8ae7bcc45822" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentConvertibleThresholdTradingDays"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_c863a1b6-fe3a-479f-9a5d-8ae7bcc45822" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleStockPriceTrigger_2a88d344-aa2f-4830-a164-1337bc3d499e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentConvertibleStockPriceTrigger"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_us-gaap_DebtInstrumentConvertibleStockPriceTrigger_2a88d344-aa2f-4830-a164-1337bc3d499e" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_DebtInstrumentConvertibleThresholdTradingVolume_68944407-484c-4da8-80c4-8e1f48f3cbf3" xlink:href="cbstf-20240930.xsd#cbstf_DebtInstrumentConvertibleThresholdTradingVolume"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_cbstf_DebtInstrumentConvertibleThresholdTradingVolume_68944407-484c-4da8-80c4-8e1f48f3cbf3" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_DebtConversionRemainingAuthorizedRepurchaseAmount_fdf4a645-8f19-4f43-813d-88652fd9e229" xlink:href="cbstf-20240930.xsd#cbstf_DebtConversionRemainingAuthorizedRepurchaseAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_cbstf_DebtConversionRemainingAuthorizedRepurchaseAmount_fdf4a645-8f19-4f43-813d-88652fd9e229" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_DebtConversionAuthorizedRepurchaseAmount_515a2d1e-eade-4bac-b716-ef3573226fa2" xlink:href="cbstf-20240930.xsd#cbstf_DebtConversionAuthorizedRepurchaseAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_cbstf_DebtConversionAuthorizedRepurchaseAmount_515a2d1e-eade-4bac-b716-ef3573226fa2" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleNumberOfEquityInstruments_1834c4c1-e5b7-45b7-a177-9cdda7fb7076" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentConvertibleNumberOfEquityInstruments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_us-gaap_DebtInstrumentConvertibleNumberOfEquityInstruments_1834c4c1-e5b7-45b7-a177-9cdda7fb7076" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_f7e9062f-6190-4ba3-b3ed-bda6a24a4605" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_f7e9062f-6190-4ba3-b3ed-bda6a24a4605" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_DebtInstrumentNumberOfMonthlyInstallments_da9aa2b7-06aa-4be2-9edc-ecde44e337af" xlink:href="cbstf-20240930.xsd#cbstf_DebtInstrumentNumberOfMonthlyInstallments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_cbstf_DebtInstrumentNumberOfMonthlyInstallments_da9aa2b7-06aa-4be2-9edc-ecde44e337af" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid_0e62c8a1-e25e-4fd6-8a6a-f0039f8a0696" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_us-gaap_DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid_0e62c8a1-e25e-4fd6-8a6a-f0039f8a0696" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentOfFinancingAndStockIssuanceCosts_d610db61-ae04-45c1-a4c1-489a9b13e9b8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentOfFinancingAndStockIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_us-gaap_PaymentOfFinancingAndStockIssuanceCosts_d610db61-ae04-45c1-a4c1-489a9b13e9b8" xlink:type="arc" order="30"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_8a8199ba-3373-4e4f-b161-ffbe50255f5c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cbstf_DebtDisclosureLineItems_dc46ce33-acc4-4947-b6b6-8255e8eaa3fa" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_8a8199ba-3373-4e4f-b161-ffbe50255f5c" xlink:type="arc" order="31"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://cannabistcompany.com/role/PropertyandEquipmentDetails" xlink:type="simple" xlink:href="cbstf-20240930.xsd#PropertyandEquipmentDetails"/>
  <link:definitionLink xlink:role="http://cannabistcompany.com/role/PropertyandEquipmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8309427f-b4b0-43c7-b382-be316a8d082e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_eb8382d7-2c91-46be-88de-d07b81387fb9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8309427f-b4b0-43c7-b382-be316a8d082e" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_eb8382d7-2c91-46be-88de-d07b81387fb9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_630fdd7e-dff6-48e7-9508-c58d9dc05280" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_eb8382d7-2c91-46be-88de-d07b81387fb9" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_630fdd7e-dff6-48e7-9508-c58d9dc05280" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_630fdd7e-dff6-48e7-9508-c58d9dc05280_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_630fdd7e-dff6-48e7-9508-c58d9dc05280" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_630fdd7e-dff6-48e7-9508-c58d9dc05280_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_df52235b-dd26-4333-97c2-8fecce2391cf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_630fdd7e-dff6-48e7-9508-c58d9dc05280" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_df52235b-dd26-4333-97c2-8fecce2391cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandAndBuildingMember_9d3b4e44-ede8-444d-bd3f-61abcc485799" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LandAndBuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_df52235b-dd26-4333-97c2-8fecce2391cf" xlink:to="loc_us-gaap_LandAndBuildingMember_9d3b4e44-ede8-444d-bd3f-61abcc485799" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_da850894-24dd-4699-b7bd-9b49708d99b1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FurnitureAndFixturesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_df52235b-dd26-4333-97c2-8fecce2391cf" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_da850894-24dd-4699-b7bd-9b49708d99b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquipmentMember_b1bf945a-c52d-417f-a382-40eb57e6f1d6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_df52235b-dd26-4333-97c2-8fecce2391cf" xlink:to="loc_us-gaap_EquipmentMember_b1bf945a-c52d-417f-a382-40eb57e6f1d6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_ComputersAndSoftwareMember_4e6165c6-c923-4f64-bf54-6ae332749c7d" xlink:href="cbstf-20240930.xsd#cbstf_ComputersAndSoftwareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_df52235b-dd26-4333-97c2-8fecce2391cf" xlink:to="loc_cbstf_ComputersAndSoftwareMember_4e6165c6-c923-4f64-bf54-6ae332749c7d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_cca53af0-d982-4b68-ac7f-98fe43208c76" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LeaseholdImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_df52235b-dd26-4333-97c2-8fecce2391cf" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_cca53af0-d982-4b68-ac7f-98fe43208c76" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionInProgressMember_07b69ada-eebc-4265-9b04-a948f2694ef6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ConstructionInProgressMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_df52235b-dd26-4333-97c2-8fecce2391cf" xlink:to="loc_us-gaap_ConstructionInProgressMember_07b69ada-eebc-4265-9b04-a948f2694ef6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_14445272-da17-48bf-9292-068bc3aee8ae" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_eb8382d7-2c91-46be-88de-d07b81387fb9" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_14445272-da17-48bf-9292-068bc3aee8ae" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_14445272-da17-48bf-9292-068bc3aee8ae_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_14445272-da17-48bf-9292-068bc3aee8ae" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_14445272-da17-48bf-9292-068bc3aee8ae_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_a51d62fd-9586-4896-b022-acebe06563c6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_14445272-da17-48bf-9292-068bc3aee8ae" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_a51d62fd-9586-4896-b022-acebe06563c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_fa851d4f-ace3-45cf-9d2d-a9f9f8927dd2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_a51d62fd-9586-4896-b022-acebe06563c6" xlink:to="loc_us-gaap_CostOfSalesMember_fa851d4f-ace3-45cf-9d2d-a9f9f8927dd2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_76a5a9f5-7ebd-4135-9315-f604b2f39b4c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_a51d62fd-9586-4896-b022-acebe06563c6" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_76a5a9f5-7ebd-4135-9315-f604b2f39b4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_18a5ff0f-bb2b-420e-9acb-4217670f86b7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8309427f-b4b0-43c7-b382-be316a8d082e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_18a5ff0f-bb2b-420e-9acb-4217670f86b7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_3bc8919a-0b65-45ee-a029-d183bb8b119a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8309427f-b4b0-43c7-b382-be316a8d082e" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_3bc8919a-0b65-45ee-a029-d183bb8b119a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_16708bc8-7501-4d7e-a1dd-43e6a2cf68c2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8309427f-b4b0-43c7-b382-be316a8d082e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_16708bc8-7501-4d7e-a1dd-43e6a2cf68c2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_5cae17af-30d3-483e-a1f9-830f3d0df81f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Depreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8309427f-b4b0-43c7-b382-be316a8d082e" xlink:to="loc_us-gaap_Depreciation_5cae17af-30d3-483e-a1f9-830f3d0df81f" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://cannabistcompany.com/role/ShareholdersEquityDetails" xlink:type="simple" xlink:href="cbstf-20240930.xsd#ShareholdersEquityDetails"/>
  <link:definitionLink xlink:role="http://cannabistcompany.com/role/ShareholdersEquityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a27a2659-ce67-4a10-a26a-cf00d98da156" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b2e1559b-df33-4aba-b501-4421eea8b1cd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a27a2659-ce67-4a10-a26a-cf00d98da156" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b2e1559b-df33-4aba-b501-4421eea8b1cd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_86fb65f9-e039-47cb-a31d-dff3b42bcf3e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b2e1559b-df33-4aba-b501-4421eea8b1cd" xlink:to="loc_us-gaap_AwardTypeAxis_86fb65f9-e039-47cb-a31d-dff3b42bcf3e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_86fb65f9-e039-47cb-a31d-dff3b42bcf3e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_86fb65f9-e039-47cb-a31d-dff3b42bcf3e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_86fb65f9-e039-47cb-a31d-dff3b42bcf3e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_8b77533b-a9dd-462c-8252-e73bb348df74" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_86fb65f9-e039-47cb-a31d-dff3b42bcf3e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_8b77533b-a9dd-462c-8252-e73bb348df74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_194f150c-7b18-45ad-a491-e40b57d59b05" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_8b77533b-a9dd-462c-8252-e73bb348df74" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_194f150c-7b18-45ad-a491-e40b57d59b05" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_32b0e260-6ad8-4a75-86b9-7a7f33485466" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b2e1559b-df33-4aba-b501-4421eea8b1cd" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_32b0e260-6ad8-4a75-86b9-7a7f33485466" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_32b0e260-6ad8-4a75-86b9-7a7f33485466_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_32b0e260-6ad8-4a75-86b9-7a7f33485466" xlink:to="loc_us-gaap_EquityComponentDomain_32b0e260-6ad8-4a75-86b9-7a7f33485466_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_bbaca4de-abd4-4fe6-a603-ce5a16a11682" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_32b0e260-6ad8-4a75-86b9-7a7f33485466" xlink:to="loc_us-gaap_EquityComponentDomain_bbaca4de-abd4-4fe6-a603-ce5a16a11682" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_657a5d25-4dae-4483-8c62-91bd2382cccc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_bbaca4de-abd4-4fe6-a603-ce5a16a11682" xlink:to="loc_us-gaap_CommonStockMember_657a5d25-4dae-4483-8c62-91bd2382cccc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_5df76fb6-69d4-488b-b833-46bb70ce8a2e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b2e1559b-df33-4aba-b501-4421eea8b1cd" xlink:to="loc_us-gaap_DebtInstrumentAxis_5df76fb6-69d4-488b-b833-46bb70ce8a2e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_5df76fb6-69d4-488b-b833-46bb70ce8a2e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_5df76fb6-69d4-488b-b833-46bb70ce8a2e" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_5df76fb6-69d4-488b-b833-46bb70ce8a2e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_c5fd7719-2ae7-45b2-a54e-313adfab677d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_5df76fb6-69d4-488b-b833-46bb70ce8a2e" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_c5fd7719-2ae7-45b2-a54e-313adfab677d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_TwentyTwentyFourNotesMember_bf15aeb1-de23-4b3e-b136-3d400d3ebdc9" xlink:href="cbstf-20240930.xsd#cbstf_TwentyTwentyFourNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_c5fd7719-2ae7-45b2-a54e-313adfab677d" xlink:to="loc_cbstf_TwentyTwentyFourNotesMember_bf15aeb1-de23-4b3e-b136-3d400d3ebdc9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_TwentyTwentySevenConvertibleNotesMember_c9bbc38a-f4ff-4aa9-9b95-12fed473a316" xlink:href="cbstf-20240930.xsd#cbstf_TwentyTwentySevenConvertibleNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_c5fd7719-2ae7-45b2-a54e-313adfab677d" xlink:to="loc_cbstf_TwentyTwentySevenConvertibleNotesMember_c9bbc38a-f4ff-4aa9-9b95-12fed473a316" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonmonetaryTransactionTypeAxis_3da9922f-bddf-4dc4-96d9-fbd64a4d4a06" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NonmonetaryTransactionTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b2e1559b-df33-4aba-b501-4421eea8b1cd" xlink:to="loc_us-gaap_NonmonetaryTransactionTypeAxis_3da9922f-bddf-4dc4-96d9-fbd64a4d4a06" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonmonetaryTransactionTypeDomain_3da9922f-bddf-4dc4-96d9-fbd64a4d4a06_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NonmonetaryTransactionTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_NonmonetaryTransactionTypeAxis_3da9922f-bddf-4dc4-96d9-fbd64a4d4a06" xlink:to="loc_us-gaap_NonmonetaryTransactionTypeDomain_3da9922f-bddf-4dc4-96d9-fbd64a4d4a06_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonmonetaryTransactionTypeDomain_c8f0d79f-beaa-4a62-a8c3-3f34d9f47a13" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NonmonetaryTransactionTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_NonmonetaryTransactionTypeAxis_3da9922f-bddf-4dc4-96d9-fbd64a4d4a06" xlink:to="loc_us-gaap_NonmonetaryTransactionTypeDomain_c8f0d79f-beaa-4a62-a8c3-3f34d9f47a13" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_GreenLeafTransactionMember_b114b821-da88-4b04-85ff-961b4e007335" xlink:href="cbstf-20240930.xsd#cbstf_GreenLeafTransactionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonmonetaryTransactionTypeDomain_c8f0d79f-beaa-4a62-a8c3-3f34d9f47a13" xlink:to="loc_cbstf_GreenLeafTransactionMember_b114b821-da88-4b04-85ff-961b4e007335" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits_32af0890-77be-48b1-b2c8-05248eb3d1e3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a27a2659-ce67-4a10-a26a-cf00d98da156" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits_32af0890-77be-48b1-b2c8-05248eb3d1e3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebt_83b51d23-9da0-48cc-86bd-61045f81226a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ConvertibleDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a27a2659-ce67-4a10-a26a-cf00d98da156" xlink:to="loc_us-gaap_ConvertibleDebt_83b51d23-9da0-48cc-86bd-61045f81226a" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://cannabistcompany.com/role/WarrantsSummaryofOutstandingEquityClassifiedWarrantstoPurchaseCommonStockDetails" xlink:type="simple" xlink:href="cbstf-20240930.xsd#WarrantsSummaryofOutstandingEquityClassifiedWarrantstoPurchaseCommonStockDetails"/>
  <link:definitionLink xlink:role="http://cannabistcompany.com/role/WarrantsSummaryofOutstandingEquityClassifiedWarrantstoPurchaseCommonStockDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightLineItems_3624afd7-7d9d-422f-b6e7-e8a859a55f88" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ClassOfWarrantOrRightLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightTable_6071e80d-bf01-4d50-a1a1-7636553fc660" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ClassOfWarrantOrRightTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_3624afd7-7d9d-422f-b6e7-e8a859a55f88" xlink:to="loc_us-gaap_ClassOfWarrantOrRightTable_6071e80d-bf01-4d50-a1a1-7636553fc660" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_3f7946b4-515d-4180-8353-39f3a2434fc0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfWarrantOrRightTable_6071e80d-bf01-4d50-a1a1-7636553fc660" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_3f7946b4-515d-4180-8353-39f3a2434fc0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_3f7946b4-515d-4180-8353-39f3a2434fc0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_3f7946b4-515d-4180-8353-39f3a2434fc0" xlink:to="loc_us-gaap_EquityComponentDomain_3f7946b4-515d-4180-8353-39f3a2434fc0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_67b8bda0-bee7-403e-b74b-f0b1a5b681fb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_3f7946b4-515d-4180-8353-39f3a2434fc0" xlink:to="loc_us-gaap_EquityComponentDomain_67b8bda0-bee7-403e-b74b-f0b1a5b681fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantMember_1f9caa27-f973-4c20-b7d1-735e82e7b29b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_WarrantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_67b8bda0-bee7-403e-b74b-f0b1a5b681fb" xlink:to="loc_us-gaap_WarrantMember_1f9caa27-f973-4c20-b7d1-735e82e7b29b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightAxis_4d9bb1ff-6b8e-4af9-97f1-5426432f1f80" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ClassOfWarrantOrRightAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfWarrantOrRightTable_6071e80d-bf01-4d50-a1a1-7636553fc660" xlink:to="loc_us-gaap_ClassOfWarrantOrRightAxis_4d9bb1ff-6b8e-4af9-97f1-5426432f1f80" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_4d9bb1ff-6b8e-4af9-97f1-5426432f1f80_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_4d9bb1ff-6b8e-4af9-97f1-5426432f1f80" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_4d9bb1ff-6b8e-4af9-97f1-5426432f1f80_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_01c8417b-bdf9-436b-bdfd-df326caba904" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_4d9bb1ff-6b8e-4af9-97f1-5426432f1f80" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_01c8417b-bdf9-436b-bdfd-df326caba904" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_ClassOfWarrantOrRightExpirationDateOneMember_d0ebe34d-5272-4cab-bbd7-c98706a8c66b" xlink:href="cbstf-20240930.xsd#cbstf_ClassOfWarrantOrRightExpirationDateOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_01c8417b-bdf9-436b-bdfd-df326caba904" xlink:to="loc_cbstf_ClassOfWarrantOrRightExpirationDateOneMember_d0ebe34d-5272-4cab-bbd7-c98706a8c66b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_ClassOfWarrantOrRightExpirationDateTwoMember_c0c2fd5d-2746-4dda-9788-97adc648a769" xlink:href="cbstf-20240930.xsd#cbstf_ClassOfWarrantOrRightExpirationDateTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_01c8417b-bdf9-436b-bdfd-df326caba904" xlink:to="loc_cbstf_ClassOfWarrantOrRightExpirationDateTwoMember_c0c2fd5d-2746-4dda-9788-97adc648a769" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_ClassOfWarrantOrRightExpirationDateThreeMember_c7336803-9ce0-4e89-8400-1cf15f4341ff" xlink:href="cbstf-20240930.xsd#cbstf_ClassOfWarrantOrRightExpirationDateThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_01c8417b-bdf9-436b-bdfd-df326caba904" xlink:to="loc_cbstf_ClassOfWarrantOrRightExpirationDateThreeMember_c7336803-9ce0-4e89-8400-1cf15f4341ff" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightOutstanding_aa1dfd22-9968-48e9-a636-c149e06daf62" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ClassOfWarrantOrRightOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_3624afd7-7d9d-422f-b6e7-e8a859a55f88" xlink:to="loc_us-gaap_ClassOfWarrantOrRightOutstanding_aa1dfd22-9968-48e9-a636-c149e06daf62" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_80a829e7-ccf4-476c-be20-9ecf13cacb05" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_3624afd7-7d9d-422f-b6e7-e8a859a55f88" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_80a829e7-ccf4-476c-be20-9ecf13cacb05" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://cannabistcompany.com/role/FinancialInstrumentsandFairValueMeasurementsScheduleofFinancialInstrumentsMeasuredatFairValueDetails" xlink:type="simple" xlink:href="cbstf-20240930.xsd#FinancialInstrumentsandFairValueMeasurementsScheduleofFinancialInstrumentsMeasuredatFairValueDetails"/>
  <link:definitionLink xlink:role="http://cannabistcompany.com/role/FinancialInstrumentsandFairValueMeasurementsScheduleofFinancialInstrumentsMeasuredatFairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_c46580d0-0e34-4205-b6d5-bfd5ec8edb07" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_91797308-2fab-4c80-967b-05598e99889e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_c46580d0-0e34-4205-b6d5-bfd5ec8edb07" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_91797308-2fab-4c80-967b-05598e99889e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_e3c84e3a-8d62-4e30-8eab-d839621a6716" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_91797308-2fab-4c80-967b-05598e99889e" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_e3c84e3a-8d62-4e30-8eab-d839621a6716" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e3c84e3a-8d62-4e30-8eab-d839621a6716_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_e3c84e3a-8d62-4e30-8eab-d839621a6716" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e3c84e3a-8d62-4e30-8eab-d839621a6716_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_db8d084a-7fbe-43d1-9697-05f9079fe824" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_e3c84e3a-8d62-4e30-8eab-d839621a6716" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_db8d084a-7fbe-43d1-9697-05f9079fe824" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_dc3f95d8-0251-4803-ba00-9d906343f4ba" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_db8d084a-7fbe-43d1-9697-05f9079fe824" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_dc3f95d8-0251-4803-ba00-9d906343f4ba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_858b0b64-c4e2-4e8a-aea7-8adadba49115" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_db8d084a-7fbe-43d1-9697-05f9079fe824" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_858b0b64-c4e2-4e8a-aea7-8adadba49115" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_2b9c7821-3079-4d11-8e97-10f75bc866ae" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_db8d084a-7fbe-43d1-9697-05f9079fe824" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_2b9c7821-3079-4d11-8e97-10f75bc866ae" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_6ef1ba0e-8bfe-4b37-9c83-4a17c933a90a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_91797308-2fab-4c80-967b-05598e99889e" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_6ef1ba0e-8bfe-4b37-9c83-4a17c933a90a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_6ef1ba0e-8bfe-4b37-9c83-4a17c933a90a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_6ef1ba0e-8bfe-4b37-9c83-4a17c933a90a" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_6ef1ba0e-8bfe-4b37-9c83-4a17c933a90a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_9bae20d9-35b4-487a-9000-a78796c53290" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_6ef1ba0e-8bfe-4b37-9c83-4a17c933a90a" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_9bae20d9-35b4-487a-9000-a78796c53290" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_1ebcf1be-3c5b-4937-85ce-055f30120e5d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_9bae20d9-35b4-487a-9000-a78796c53290" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_1ebcf1be-3c5b-4937-85ce-055f30120e5d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedAtFairValue_56c88561-bc29-4a47-90a7-3dc863cc3167" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InvestmentOwnedAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_c46580d0-0e34-4205-b6d5-bfd5ec8edb07" xlink:to="loc_us-gaap_InvestmentOwnedAtFairValue_56c88561-bc29-4a47-90a7-3dc863cc3167" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_8bacedad-1741-4c5e-9fe7-424f47e30549" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_c46580d0-0e34-4205-b6d5-bfd5ec8edb07" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_8bacedad-1741-4c5e-9fe7-424f47e30549" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilitiesNoncurrent_b02c7263-0aa9-40e7-ac21-11c20acc7c51" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_c46580d0-0e34-4205-b6d5-bfd5ec8edb07" xlink:to="loc_us-gaap_DerivativeLiabilitiesNoncurrent_b02c7263-0aa9-40e7-ac21-11c20acc7c51" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialLiabilitiesFairValueDisclosure_cf02f004-23f6-4022-8be2-da611c948f7a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FinancialLiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_c46580d0-0e34-4205-b6d5-bfd5ec8edb07" xlink:to="loc_us-gaap_FinancialLiabilitiesFairValueDisclosure_cf02f004-23f6-4022-8be2-da611c948f7a" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://cannabistcompany.com/role/GoodwillandIntangibleAssetsScheduleofGoodwillandIntangibleAssetsDetails" xlink:type="simple" xlink:href="cbstf-20240930.xsd#GoodwillandIntangibleAssetsScheduleofGoodwillandIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://cannabistcompany.com/role/GoodwillandIntangibleAssetsScheduleofGoodwillandIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_be96e7fe-9362-4b8c-9c70-cfb73ffe0fb8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_213e0849-814c-44e1-a456-6f8147db807b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_be96e7fe-9362-4b8c-9c70-cfb73ffe0fb8" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_213e0849-814c-44e1-a456-6f8147db807b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_733fd291-7e52-455f-938f-6cbce9905f8f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_213e0849-814c-44e1-a456-6f8147db807b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_733fd291-7e52-455f-938f-6cbce9905f8f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_733fd291-7e52-455f-938f-6cbce9905f8f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_733fd291-7e52-455f-938f-6cbce9905f8f" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_733fd291-7e52-455f-938f-6cbce9905f8f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_e3073cc0-689b-4ef9-b9cb-b6136c23b79c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_733fd291-7e52-455f-938f-6cbce9905f8f" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_e3073cc0-689b-4ef9-b9cb-b6136c23b79c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LicensingAgreementsMember_fea0f95f-9991-4702-99bf-e11c705f3803" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LicensingAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_e3073cc0-689b-4ef9-b9cb-b6136c23b79c" xlink:to="loc_us-gaap_LicensingAgreementsMember_fea0f95f-9991-4702-99bf-e11c705f3803" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksMember_154395f3-ad7b-4030-8c83-9b201eb1624c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TrademarksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_e3073cc0-689b-4ef9-b9cb-b6136c23b79c" xlink:to="loc_us-gaap_TrademarksMember_154395f3-ad7b-4030-8c83-9b201eb1624c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_1313705e-55a0-4be7-8c3d-8810773d8e5a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_e3073cc0-689b-4ef9-b9cb-b6136c23b79c" xlink:to="loc_us-gaap_CustomerRelationshipsMember_1313705e-55a0-4be7-8c3d-8810773d8e5a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillGross_a2494159-7400-42a2-bfe7-f429b8d53c2d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GoodwillGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_be96e7fe-9362-4b8c-9c70-cfb73ffe0fb8" xlink:to="loc_us-gaap_GoodwillGross_a2494159-7400-42a2-bfe7-f429b8d53c2d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_fd6d2e89-6233-4f10-8648-b753fab9add8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GoodwillImpairedAccumulatedImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_be96e7fe-9362-4b8c-9c70-cfb73ffe0fb8" xlink:to="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_fd6d2e89-6233-4f10-8648-b753fab9add8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_14adfe74-11a3-4e02-8d36-a9f45e048c34" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_be96e7fe-9362-4b8c-9c70-cfb73ffe0fb8" xlink:to="loc_us-gaap_Goodwill_14adfe74-11a3-4e02-8d36-a9f45e048c34" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_1e5ac07b-a1a9-420a-ac1e-e6cca46d9de2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_be96e7fe-9362-4b8c-9c70-cfb73ffe0fb8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_1e5ac07b-a1a9-420a-ac1e-e6cca46d9de2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_8ba76e5b-8c69-497e-8946-9b1f5d947a3d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_be96e7fe-9362-4b8c-9c70-cfb73ffe0fb8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_8ba76e5b-8c69-497e-8946-9b1f5d947a3d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_c02bc403-08a3-4120-8729-34def8470425" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_be96e7fe-9362-4b8c-9c70-cfb73ffe0fb8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_c02bc403-08a3-4120-8729-34def8470425" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://cannabistcompany.com/role/DivestitureAdditionalInformationDetails" xlink:type="simple" xlink:href="cbstf-20240930.xsd#DivestitureAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://cannabistcompany.com/role/DivestitureAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_a6cfde6d-bc44-4fe6-bb0e-d9bc65bcd2b9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_457700c2-0622-4a4b-91e2-50f042b756b4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_a6cfde6d-bc44-4fe6-bb0e-d9bc65bcd2b9" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_457700c2-0622-4a4b-91e2-50f042b756b4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_69832c32-c07b-4e1f-a105-76d09e1340ba" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_457700c2-0622-4a4b-91e2-50f042b756b4" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_69832c32-c07b-4e1f-a105-76d09e1340ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_69832c32-c07b-4e1f-a105-76d09e1340ba_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_69832c32-c07b-4e1f-a105-76d09e1340ba" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_69832c32-c07b-4e1f-a105-76d09e1340ba_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_3974b39b-041e-4f2c-a228-c4d3cd961ea3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_69832c32-c07b-4e1f-a105-76d09e1340ba" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_3974b39b-041e-4f2c-a228-c4d3cd961ea3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupHeldForSaleOrDisposedOfBySaleNotDiscontinuedOperationsMember_c74c629b-8c6e-43f7-aff7-1e3043743ad1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupHeldForSaleOrDisposedOfBySaleNotDiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_3974b39b-041e-4f2c-a228-c4d3cd961ea3" xlink:to="loc_us-gaap_DisposalGroupHeldForSaleOrDisposedOfBySaleNotDiscontinuedOperationsMember_c74c629b-8c6e-43f7-aff7-1e3043743ad1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_f4ce05fd-6774-45e8-909f-9d64f6ddd622" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_457700c2-0622-4a4b-91e2-50f042b756b4" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_f4ce05fd-6774-45e8-909f-9d64f6ddd622" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_f4ce05fd-6774-45e8-909f-9d64f6ddd622_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_f4ce05fd-6774-45e8-909f-9d64f6ddd622" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_f4ce05fd-6774-45e8-909f-9d64f6ddd622_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_477cf5fc-5c9c-49d3-9beb-6f1a5a303e70" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_f4ce05fd-6774-45e8-909f-9d64f6ddd622" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_477cf5fc-5c9c-49d3-9beb-6f1a5a303e70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_UtahBusinessDivestitureMember_59f1c9d4-7bcf-49f4-b0aa-a7753c4dcc6f" xlink:href="cbstf-20240930.xsd#cbstf_UtahBusinessDivestitureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_477cf5fc-5c9c-49d3-9beb-6f1a5a303e70" xlink:to="loc_cbstf_UtahBusinessDivestitureMember_59f1c9d4-7bcf-49f4-b0aa-a7753c4dcc6f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_ArizonaDivestitureMember_caab384d-1199-4fbe-94a5-147b89df4797" xlink:href="cbstf-20240930.xsd#cbstf_ArizonaDivestitureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_477cf5fc-5c9c-49d3-9beb-6f1a5a303e70" xlink:to="loc_cbstf_ArizonaDivestitureMember_caab384d-1199-4fbe-94a5-147b89df4797" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_EasternVirginiaDivestitureMember_e0f3e0f9-bcc6-4a40-91c2-1929923bc292" xlink:href="cbstf-20240930.xsd#cbstf_EasternVirginiaDivestitureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_477cf5fc-5c9c-49d3-9beb-6f1a5a303e70" xlink:to="loc_cbstf_EasternVirginiaDivestitureMember_e0f3e0f9-bcc6-4a40-91c2-1929923bc292" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_FloridaDivestitureMember_90438287-563a-4f28-b584-f4b67df2b163" xlink:href="cbstf-20240930.xsd#cbstf_FloridaDivestitureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_477cf5fc-5c9c-49d3-9beb-6f1a5a303e70" xlink:to="loc_cbstf_FloridaDivestitureMember_90438287-563a-4f28-b584-f4b67df2b163" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_NumberOfDispensaries_3d92dc36-7a46-4b64-a94a-440e2302ee93" xlink:href="cbstf-20240930.xsd#cbstf_NumberOfDispensaries"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_a6cfde6d-bc44-4fe6-bb0e-d9bc65bcd2b9" xlink:to="loc_cbstf_NumberOfDispensaries_3d92dc36-7a46-4b64-a94a-440e2302ee93" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_NumberOfFacilities_1a1e722e-895c-471f-b462-94409a58bc29" xlink:href="cbstf-20240930.xsd#cbstf_NumberOfFacilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_a6cfde6d-bc44-4fe6-bb0e-d9bc65bcd2b9" xlink:to="loc_cbstf_NumberOfFacilities_1a1e722e-895c-471f-b462-94409a58bc29" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_f82b462e-4320-4da7-b6e5-e0820dc49384" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_a6cfde6d-bc44-4fe6-bb0e-d9bc65bcd2b9" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_f82b462e-4320-4da7-b6e5-e0820dc49384" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_65858158-798c-4321-81c1-e0399906721b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProceedsFromDivestitureOfBusinesses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_a6cfde6d-bc44-4fe6-bb0e-d9bc65bcd2b9" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_65858158-798c-4321-81c1-e0399906721b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_NotesReceivable_fe239cdf-07ca-4307-a8fb-fcaa1f6e1cbe" xlink:href="cbstf-20240930.xsd#cbstf_NotesReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_a6cfde6d-bc44-4fe6-bb0e-d9bc65bcd2b9" xlink:to="loc_cbstf_NotesReceivable_fe239cdf-07ca-4307-a8fb-fcaa1f6e1cbe" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_DisposalGroupIncludingDiscontinuedOperationExpectedConsideration_b4707fa9-af01-4786-a4d6-79fff3ab2d4a" xlink:href="cbstf-20240930.xsd#cbstf_DisposalGroupIncludingDiscontinuedOperationExpectedConsideration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_a6cfde6d-bc44-4fe6-bb0e-d9bc65bcd2b9" xlink:to="loc_cbstf_DisposalGroupIncludingDiscontinuedOperationExpectedConsideration_b4707fa9-af01-4786-a4d6-79fff3ab2d4a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_DisposalGroupIncludingDiscontinuedOperationExpectedConsiderationCash_e3ec1388-edae-41e0-b599-91b3cad95df2" xlink:href="cbstf-20240930.xsd#cbstf_DisposalGroupIncludingDiscontinuedOperationExpectedConsiderationCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_a6cfde6d-bc44-4fe6-bb0e-d9bc65bcd2b9" xlink:to="loc_cbstf_DisposalGroupIncludingDiscontinuedOperationExpectedConsiderationCash_e3ec1388-edae-41e0-b599-91b3cad95df2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_DisposalGroupIncludingDiscontinuedOperationConsiderationExpectedEquityInBuyer_c5c78c88-b30b-4f5f-9a3e-c1814b5b7aa4" xlink:href="cbstf-20240930.xsd#cbstf_DisposalGroupIncludingDiscontinuedOperationConsiderationExpectedEquityInBuyer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_a6cfde6d-bc44-4fe6-bb0e-d9bc65bcd2b9" xlink:to="loc_cbstf_DisposalGroupIncludingDiscontinuedOperationConsiderationExpectedEquityInBuyer_c5c78c88-b30b-4f5f-9a3e-c1814b5b7aa4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_DisposalGroupIncludingDiscontinuedOperationExpectedConsiderationNoteReceivable_9b11c353-0279-4643-a2ad-0310025a46c1" xlink:href="cbstf-20240930.xsd#cbstf_DisposalGroupIncludingDiscontinuedOperationExpectedConsiderationNoteReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_a6cfde6d-bc44-4fe6-bb0e-d9bc65bcd2b9" xlink:to="loc_cbstf_DisposalGroupIncludingDiscontinuedOperationExpectedConsiderationNoteReceivable_9b11c353-0279-4643-a2ad-0310025a46c1" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_NoteReceivableTerm_d47767e8-e47d-4773-b1c8-9c2d4d929914" xlink:href="cbstf-20240930.xsd#cbstf_NoteReceivableTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_a6cfde6d-bc44-4fe6-bb0e-d9bc65bcd2b9" xlink:to="loc_cbstf_NoteReceivableTerm_d47767e8-e47d-4773-b1c8-9c2d4d929914" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://cannabistcompany.com/role/DivestitureSummaryofOperatingResultsDetails" xlink:type="simple" xlink:href="cbstf-20240930.xsd#DivestitureSummaryofOperatingResultsDetails"/>
  <link:definitionLink xlink:role="http://cannabistcompany.com/role/DivestitureSummaryofOperatingResultsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_c2951451-7413-4a16-9880-d9f67cce98ef" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_6da67073-1eb9-4795-adf5-5b4d980582bc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_c2951451-7413-4a16-9880-d9f67cce98ef" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_6da67073-1eb9-4795-adf5-5b4d980582bc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_f4893eac-5789-40b8-8399-ff6db51f5617" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_6da67073-1eb9-4795-adf5-5b4d980582bc" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_f4893eac-5789-40b8-8399-ff6db51f5617" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_f4893eac-5789-40b8-8399-ff6db51f5617_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_f4893eac-5789-40b8-8399-ff6db51f5617" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_f4893eac-5789-40b8-8399-ff6db51f5617_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_14d4c373-49ac-46f3-9233-fa5825cce7bb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_f4893eac-5789-40b8-8399-ff6db51f5617" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_14d4c373-49ac-46f3-9233-fa5825cce7bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_UtahBusinessDivestitureMember_611c3e11-0c85-44e6-bba8-ef99288df05b" xlink:href="cbstf-20240930.xsd#cbstf_UtahBusinessDivestitureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_14d4c373-49ac-46f3-9233-fa5825cce7bb" xlink:to="loc_cbstf_UtahBusinessDivestitureMember_611c3e11-0c85-44e6-bba8-ef99288df05b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_138ee9a4-9940-4f43-9727-50d54f974dcb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_6da67073-1eb9-4795-adf5-5b4d980582bc" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_138ee9a4-9940-4f43-9727-50d54f974dcb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_138ee9a4-9940-4f43-9727-50d54f974dcb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_138ee9a4-9940-4f43-9727-50d54f974dcb" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_138ee9a4-9940-4f43-9727-50d54f974dcb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_08257149-3ab4-4b34-8206-bb62918b2e1e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_138ee9a4-9940-4f43-9727-50d54f974dcb" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_08257149-3ab4-4b34-8206-bb62918b2e1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupHeldForSaleOrDisposedOfBySaleNotDiscontinuedOperationsMember_e86e543f-7423-440f-8770-e7d38e1dd40e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupHeldForSaleOrDisposedOfBySaleNotDiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_08257149-3ab4-4b34-8206-bb62918b2e1e" xlink:to="loc_us-gaap_DisposalGroupHeldForSaleOrDisposedOfBySaleNotDiscontinuedOperationsMember_e86e543f-7423-440f-8770-e7d38e1dd40e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_2962fdd5-2704-4eb2-9bf1-8766727a0b50" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_c2951451-7413-4a16-9880-d9f67cce98ef" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_2962fdd5-2704-4eb2-9bf1-8766727a0b50" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSoldAndOperatingExpense_70c18e24-1404-4815-8f97-aa2a7a7c70bb" xlink:href="cbstf-20240930.xsd#cbstf_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSoldAndOperatingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_c2951451-7413-4a16-9880-d9f67cce98ef" xlink:to="loc_cbstf_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSoldAndOperatingExpense_70c18e24-1404-4815-8f97-aa2a7a7c70bb" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://cannabistcompany.com/role/SubsequentEventsDetails" xlink:type="simple" xlink:href="cbstf-20240930.xsd#SubsequentEventsDetails"/>
  <link:definitionLink xlink:role="http://cannabistcompany.com/role/SubsequentEventsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_d4dfe4a3-09b6-463c-bc8e-4e246afefa89" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_0af969b9-a093-4780-9553-8b01475376b5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_d4dfe4a3-09b6-463c-bc8e-4e246afefa89" xlink:to="loc_us-gaap_SubsequentEventTable_0af969b9-a093-4780-9553-8b01475376b5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_df15f338-5ea3-4f8d-a45d-42254592df09" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_0af969b9-a093-4780-9553-8b01475376b5" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_df15f338-5ea3-4f8d-a45d-42254592df09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_df15f338-5ea3-4f8d-a45d-42254592df09_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_df15f338-5ea3-4f8d-a45d-42254592df09" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_df15f338-5ea3-4f8d-a45d-42254592df09_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_d2d3cc91-07d8-437a-8d48-25b852eb6ece" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_df15f338-5ea3-4f8d-a45d-42254592df09" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_d2d3cc91-07d8-437a-8d48-25b852eb6ece" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_c4dcd5ae-846b-4dc8-a57c-8d8fca7181af" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_d2d3cc91-07d8-437a-8d48-25b852eb6ece" xlink:to="loc_us-gaap_SubsequentEventMember_c4dcd5ae-846b-4dc8-a57c-8d8fca7181af" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfArrangementAxis_18361455-9713-4091-83e7-469e1f3947f9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_TypeOfArrangementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_0af969b9-a093-4780-9553-8b01475376b5" xlink:to="loc_us-gaap_TypeOfArrangementAxis_18361455-9713-4091-83e7-469e1f3947f9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_18361455-9713-4091-83e7-469e1f3947f9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TypeOfArrangementAxis_18361455-9713-4091-83e7-469e1f3947f9" xlink:to="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_18361455-9713-4091-83e7-469e1f3947f9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_22aa0ca9-3c70-43df-be53-bd8a2d1263e7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TypeOfArrangementAxis_18361455-9713-4091-83e7-469e1f3947f9" xlink:to="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_22aa0ca9-3c70-43df-be53-bd8a2d1263e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_FloridaLicenseMember_d96386f4-d208-445e-b95d-be6ef0154ed7" xlink:href="cbstf-20240930.xsd#cbstf_FloridaLicenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_22aa0ca9-3c70-43df-be53-bd8a2d1263e7" xlink:to="loc_cbstf_FloridaLicenseMember_d96386f4-d208-445e-b95d-be6ef0154ed7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_ccdec1c2-7906-4a99-a9a7-3768a07dc833" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_0af969b9-a093-4780-9553-8b01475376b5" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_ccdec1c2-7906-4a99-a9a7-3768a07dc833" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_ccdec1c2-7906-4a99-a9a7-3768a07dc833_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_ccdec1c2-7906-4a99-a9a7-3768a07dc833" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_ccdec1c2-7906-4a99-a9a7-3768a07dc833_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_c45569c1-86b6-46f9-9df4-7be39fb416b0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_ccdec1c2-7906-4a99-a9a7-3768a07dc833" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_c45569c1-86b6-46f9-9df4-7be39fb416b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_FloridaDivestitureMember_43ccd8c5-d39f-4404-8724-4100f610d6aa" xlink:href="cbstf-20240930.xsd#cbstf_FloridaDivestitureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_c45569c1-86b6-46f9-9df4-7be39fb416b0" xlink:to="loc_cbstf_FloridaDivestitureMember_43ccd8c5-d39f-4404-8724-4100f610d6aa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_ExpectedProceedsFromDivestitureOfBusinesses_0a108b34-e39f-4876-a7a0-a9c53a6d5aec" xlink:href="cbstf-20240930.xsd#cbstf_ExpectedProceedsFromDivestitureOfBusinesses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_d4dfe4a3-09b6-463c-bc8e-4e246afefa89" xlink:to="loc_cbstf_ExpectedProceedsFromDivestitureOfBusinesses_0a108b34-e39f-4876-a7a0-a9c53a6d5aec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_NumberOfTransactions_1851af0f-7c1d-4b83-8055-7bed04381f98" xlink:href="cbstf-20240930.xsd#cbstf_NumberOfTransactions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_d4dfe4a3-09b6-463c-bc8e-4e246afefa89" xlink:to="loc_cbstf_NumberOfTransactions_1851af0f-7c1d-4b83-8055-7bed04381f98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_NumberOfRetailLocations_ad8eecc2-7a6e-4328-8bbb-aa2e3cb21c9c" xlink:href="cbstf-20240930.xsd#cbstf_NumberOfRetailLocations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_d4dfe4a3-09b6-463c-bc8e-4e246afefa89" xlink:to="loc_cbstf_NumberOfRetailLocations_ad8eecc2-7a6e-4328-8bbb-aa2e3cb21c9c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_NumberOfFacilities_dd73fab9-6eb4-415a-9e86-8810f8e6d9b1" xlink:href="cbstf-20240930.xsd#cbstf_NumberOfFacilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_d4dfe4a3-09b6-463c-bc8e-4e246afefa89" xlink:to="loc_cbstf_NumberOfFacilities_dd73fab9-6eb4-415a-9e86-8810f8e6d9b1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_ee28396e-f3d8-4ff3-8a3e-1bad33ec84aa" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_d4dfe4a3-09b6-463c-bc8e-4e246afefa89" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_ee28396e-f3d8-4ff3-8a3e-1bad33ec84aa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cbstf_DisposalGroupIncludingDiscontinuedOperationConsiderationNoteReceivable_aac55fd1-ce33-40c8-94eb-0dc8915f7bb8" xlink:href="cbstf-20240930.xsd#cbstf_DisposalGroupIncludingDiscontinuedOperationConsiderationNoteReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_d4dfe4a3-09b6-463c-bc8e-4e246afefa89" xlink:to="loc_cbstf_DisposalGroupIncludingDiscontinuedOperationConsiderationNoteReceivable_aac55fd1-ce33-40c8-94eb-0dc8915f7bb8" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/AwardTypeOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2024/ecd-2024.xsd#AwardTypeOnly"/>
  <link:definitionLink xlink:role="http://xbrl.sec.gov/ecd/AwardTypeOnly" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember" xlink:type="arc" order="3"/>
  </link:definitionLink>
</link:linkbase>
