To live together as a couple, usually in a romantic relationship without being married.
From co- + habitate, a back-formation from habitation. This verb form became standard English by the late 18th century, derived from the noun 'cohabitation.'
Some people prefer 'cohabit' over 'cohabitate' because linguists consider 'cohabitate' slightly redundant—it's like saying 'co-live together' when 'cohabit' already means that!
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