1) a woman having regular sexual intercourse with a man who is not married to her; a woman owner of a dog, horse etc; a woman teacher, especially in private school; a woman in control (of a situation, a large household etc) (mistress)
2) (French) (a conversation) in private (tete-a-tete)
not meant to be recorded or reported as official
confidential
(having the habit of) hiding one's knowledge, feelings etc
uncommunicative
