Webster’s Revised Unabridged Dictionary · 1913
Paramour
Par′a·mour (·mo͞or), n. [F. par amour, lit., by or with love. See 2d Par, and Amour.] 1. A lover, of either sex; a wooer or a mistress (formerly in a good sense, now only in a bad one); one who takes the place, without possessing the rights, of a husband or wife; — used of a man or a woman.
The seducer appeared with dauntless front, accompanied by his paramour Macaulay.
2. Love; gallantry. [Obs.] "For paramour and jollity." Chaucer.
Par′a·mour′, Par′a·mours′ (·mo͞orz′), adv. By or with love, esp. the love of the sexes; — sometimes written as two words. [Obs.]
For par amour, I loved her first ere thou. Chaucer.