1. a woman who has control or authority over something
2. a female teacher
Usage: British
3. a woman who is very skilled at something

Examples

• She was the mistress of a large estate.
• The headmistress addressed the students at assembly.
• She is a mistress of classical piano.
• The mansion belonged to a wealthy mistress.
• He kept his relationship with his mistress secret.
• The art mistress taught watercolor painting.
• She became mistress of her own destiny.