cohabit
Concise Oxford English Dictionary © 2008 Oxford University Press:
cohabit/kəʊˈhabɪt/
▶verb (cohabits, cohabiting, cohabited)
- 1 live together and have a sexual relationship without being married.
- 2 coexist.
– derivatives
cohabitant noun,
cohabitation /-ˈteɪʃ(ə)n/ noun,
cohabitee /-ˈtiː/ noun,
cohabiter noun.
cohabitant noun,
cohabitation /-ˈteɪʃ(ə)n/ noun,
cohabitee /-ˈtiː/ noun,
cohabiter noun.
– origin C16 (earlier (ME) as cohabitation): from L. cohabitare, from co- ‘together’ + habitare ‘dwell’.
'cohabit' also found in these Oxford entries:

