Definition of “mistress” - English Dictionary

“mistress” in British English

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uk /ˈmɪs.trəs/ us /ˈmɪs.trəs/

mistress noun (WOMAN IN CONTROL)

[ S or U ] old-fashioned a woman who has control over or responsibility for someone or something:

I'll inform the mistress (of the house) of your arrival, madam.
She intends to remain mistress of (= in charge of) her own life when she gets married.

[ C ] UK old-fashioned a female school teacher:

She got a good report from her German mistress.

[ C ] old-fashioned a female owner of a dog

mistress noun (SEXUAL PARTNER)

[ C ] a woman who is having a sexual relationship with a married man:

Edward VII and his mistress, Lillie Langtry

(Definition of “mistress” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“mistress” in American English

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mistressnoun [ C ]

us /ˈmɪs·trəs/

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)