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 getsmarried.› [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 dogmis·tress (mĭs′trĭs) n. 1. A woman who has a continuing sexual relationship with a usually married man who is not her husband and from whom she generally receives material…
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