A lover, specially one in an adulterous relationship.
An illicit fan, either female or male.
A lover, of either sex; a wooer or a mistress (formerly in a great feeling, today just in a bad one); person who takes the place, without possessing the legal rights, of a husband or partner; -- utilized of a man or a female.
A lover, of either intercourse; a wooer.
A lover, of either sex, in a poor good sense; person who takes the place of a husband or partner without legal right: the only real sense of your message today in use.