Definitions from Wiktionary (Mistress)

▸ noun:  A woman, specifically one with great control, authority or ownership.
▸ noun:  A female teacher.
▸ noun:  The other woman in an extramarital relationship, generally including sexual relations.
▸ noun:  A dominatrix.
▸ noun:  A woman well skilled in anything, or having the mastery over it.
▸ noun:  a woman regarded with love and devotion; a sweetheart.
▸ noun:  (Scotland) A married woman; a wife.
▸ noun:  (obsolete) The jack in the game of bowls.
▸ noun:  A female companion to a master (a man with control, authority or ownership).
▸ verb:  (transitive, rare) Of a woman: to master; to learn or develop to a high degree of proficiency.
▸ verb:  (intransitive) To act or take the role of a mistress.
▸ noun:  (archaic) Used as the title of a married woman before her name. Now used only in the abbreviated form Mrs.
▸ noun:  (BDSM) Used as the title of a female dominant.

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