Definition of mistress noun in Oxford Advanced Learner's Dictionary. Meaning , pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. A woman who has an illicit affair — that is, a sexual relationship with someone she's not married to — is also called a mistress. It’s a somewhat old-fashioned word — it’s one-sided, sexist, and often suggests financial support in exchange for sexual favors. Examples of mistress in a Sentence The dog was always obedient to its master and mistress . the master and mistress of the house a married man who has a mistress His wife suspected that the woman she'd seen with him was his mistress . / ˈmɪs·trəs / Add to word list a woman who has a sexual relationship over a long period of time with a man who is not her husband (Definition of mistress from the Cambridge Academic Content Dictionary © Cambridge University Press)
