Definition of concubine noun from the Oxford Advanced Learner's Dictionary

 

concubine

 noun
noun
BrE BrE//ˈkɒŋkjubaɪn//
 
; NAmE NAmE//ˈkɑːŋkjubaɪn//
 
 
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(especially in some societies in the past) a woman who lives with a man, often in addition to his wife or wives, but who is less important than they are The sultan’s wives and concubines lived in the harem. Word Origin Middle English: from Old French, from Latin concubina, from con- ‘with’ + cubare ‘to lie’.
See the Oxford Advanced American Dictionary entry: concubine