What does cohabit mean?
Cohabit means to live together in the same dwelling, most commonly referring to an unmarried couple sharing a home in an ongoing relationship. Derived from the Latin 'cohabitare' — literally 'to dwell together' — the word entered English in the early seventeenth century and has since become a standard term in sociology, law, and everyday speech. While its broader sense can describe any individuals sharing living quarters, such as roommates, the dominant modern usage concerns couples who live together without marrying, a lifestyle that has grown steadily more common across much of Europe and North America. The word itself is neutral and factual in tone, appearing routinely in census reports, legal documents, and academic studies of family structure. Related forms include 'cohabitation', the noun describing such an arrangement, and 'cohabitant', meaning a person who shares the household.
verbTo live together as a couple, typically without being married; more broadly, to share the same living space.
- To live together as an unmarried couple in a sexual relationship.
- To share the same dwelling space with another person or group.
"After dating for two years, they decided to cohabit before getting engaged."
"Many couples now cohabit for several years before deciding whether to marry."
"The study examined how roommates who cohabit negotiate shared expenses."
Cohabit comes from the same Latin root as 'habitat' — the word biologists use for where animals live — because at heart it just means sharing one dwelling.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cohabit
Cohabit derives from the Late Latin verb 'cohabitare', formed from the prefix 'co-' (together) plus 'habitare' (to dwell), a frequentative form related to 'habere' (to have or hold). It entered English usage in the early seventeenth century. The same Latin root 'habitare' underlies a family of English words including 'habitat', 'inhabit', and 'habitation', all concerned in some way with dwelling or occupancy.
Related word forms
How cohabit is actually used
The first sense carries social and sometimes legal weight: in many jurisdictions, 'cohabiting' partners have distinct legal status from married spouses. The term is neutral to formal in register and appears frequently in sociological, legal, and demographic writing; the colloquial expression 'shack up' conveys a similar meaning informally. In British English, 'cohabit' often implies an unmarried couple, while the broader sense of merely sharing a residence is less common.
Easily confused with cohabit
Inhabit means to live in or occupy a place (as animals or people occupy a region), while cohabit specifically means to live together with another person.
Cohabitate is a nonstandard back-formation; the established verb is simply cohabit.