Definitions
1.NounA woman, specifically one with great control, authority or ownership."She was the mistress of the estate-mansion, and owned the horses."
2.NounA female head of household.
3.NounA female teacher."games mistress"
4.NounThe other woman in an extramarital relationship, generally including sexual relations.
5.NounA dominatrix.
6.NounA woman well skilled in anything, or having the mastery over it.
7.NounA woman regarded with love and devotion; a sweetheart.
8.NounA married woman; a wife.
9.NounA respectful mode of address to a woman.
10.NounThe jack in the game of bowls.
11.NounA female companion to a master (a man with control, authority or ownership).
12.NounFemale equivalent of master.
13.NounFemale equivalent of mister.
14.VerbOf a woman: to master; to learn or develop to a high degree of proficiency.
15.VerbTo act or take the role of a mistress.