mistress
noun uk/ˈmɪs.trəs/ us/ˈmɪs.trəs/
(WOMAN IN CONTROL)
[ S or U ] old-fashioned女主人；女能人；起主宰作用的女子
a woman who has control over or responsibility for someone or something
I'll inform the mistress (of the house) of your arrival, madam. 夫人，我去告诉女主人您来了。
She intends to remain mistress of (= in charge of) her own life when she gets married. 她想在结婚后仍做自己生活的主人。
[ C ] UK old-fashioned女教师
a female school teacher
She got a good report from her German mistress. 她的德语女教师给了她很好的成绩。
[ C ] old-fashioned狗的女主人
a female owner of a dog
(SEXUAL PARTNER)
[ C ]情妇
a woman who is having a sexual relationship with a married man
Edward VII and his mistress, Lillie Langtry 爱德华七世和他的情妇莉莉‧兰特里