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English definition of “mistress”

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mistress

noun uk   /ˈmɪs.trəs/ us  

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 Learners Dictionary & Thesaurus © Cambridge University Press)
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