co ‧ hab ‧ it /kəʊˈhæbət, kəʊˈhæbɪt $ koʊ-/ BrE AmE verb [intransitive]
[ Date: 1500-1600 ; Language: Late Latin ; Origin: cohabitare , from Latin co- ( ⇨ ↑ co- ) + habitare ( , ↑ habitation ) ]
to live with another person and have a sexual relationship with them without being married SYN live together
—cohabitation /kəʊˌhæbəˈteɪʃ ə n, kəʊˌhæbɪˈteɪʃ ə n $ koʊ-/ noun [uncountable]