Synonyms of 'concubine'
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In former times, a courtesan was a woman who had sexual relationships with rich and powerful men for money.
a courtesan who was kept by some of 16th-century Venice's most powerful men
A married man's mistress is a woman who is not his wife and with whom he is having a sexual relationship.
He has a wife and a mistress.
Thesaurus for concubine from the Collins English Thesaurus
In former times, a concubine was a woman who lived with and had a sexual relationship with a man of higher social rank without being married to him.