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Definition of concubine noun from the Oxford Advanced American Dictionary

 

concubine

 noun
noun
NAmE//ˈkɑŋkyəˌbaɪn//
 
 
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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.
See the Oxford Advanced Learner's Dictionary entry: concubine