mistress
//ˈmɪstrəs//
Noun
mistressSingular
mistressesPlural
1
A woman who has a continuing sexual relationship with a man who is married to someone else.
He kept his mistress in a separate apartment across town.
2
A woman in a position of authority or control, especially the female head of a household.
She was the mistress of a large estate.
3
A female owner of a pet or animal.
The dog ran happily to its mistress when she came home.
4
A female teacher, especially in a school (archaic or British).
The music mistress taught us how to play the piano.
5
A woman who is skilled or proficient in a particular subject or activity.
She is a mistress of the culinary arts.