[ˈmɪstrɪs], (Noun)

Definitions:
- a woman in a position of authority or control
(e.g: she is always mistress of the situation, coolly self-possessed)

- a woman (other than the man's wife) having a sexual relationship with a married man
(e.g: Elsie knew her husband had a mistress tucked away somewhere)

- used as a title prefixed to the name of a married woman; Mrs


Phrases:

Origin:
Middle English: from Old French maistresse, from maistre ‘master’