a woman who cohabits with a man to whom she is not legally married, esp. one regarded as socially or sexually subservient; mistress.

(among polygamous peoples) a secondary wife, usually of inferior rank.

(esp. formerly in Muslim societies) a woman residing in a harem and kept, as by a sultan, for sexual purposes.

noun

courtesan , kept woman , mistress , harem , odalisque , paramour , pl. harem , seraglio , slave