mistress Definition in the Cambridge English Dictionary
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Definition of “mistress” - English Dictionary

Definition of "mistress" - American English Dictionary

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mistressnoun [C]

 us   /ˈmɪs·trəs/
a woman who has a ​sexualrelationship over a ​longperiod of ​time with a man who is not her ​husband
(Definition of mistress from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "mistress" - British English Dictionary

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mistressnoun

uk   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 ​yourarrival, ​madam. She ​intends to ​remain mistress of (= in ​charge of) her own ​life when she gets ​married. [C] UK old-fashioned a ​femaleschoolteacher: She got a good ​report from her ​German mistress. [C] old-fashioned a ​femaleowner of a ​dog

mistress noun (SEXUAL PARTNER)

[C] a woman who is having a ​sexualrelationship 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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