con ‧ cu ‧ bine /ˈkɒŋkjəbaɪn, ˈkɒŋkjʊbaɪn $ ˈkɑːŋ-/ BrE AmE noun [countable]
[ Date: 1200-1300 ; Language: Old French ; Origin: Latin concubina , from com- ( ⇨ COM- ) + cubare 'to lie' ]
a woman in the past who lived with and had sex with a man who already had a wife or wives, but who was socially less important than the wives