The state of holding or owning property together with one or more other people; joint tenancy or shared ownership.
From co- plus tenancy (from Latin 'tenere' meaning to hold). In legal terminology, this describes when multiple people have equal rights to the same property.
Cotenancy is why roommates' lease agreements are so important—you and your roommates are technically cotenants with equal legal rights to the entire apartment, which can create problems if someone wants to break the lease!
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