paramour

par·a·mour  (pr-mr)

n.

A lover, especially one in an adulterous relationship.

---

[Middle English, from par amour, by way of love, passionately, from Anglo-Norman : par, by (from Latin per; see per¹ in Indo-European roots) + amour, love (from Latin amor, from amre, to love).]

---

paramour

Noun

Old-fashioned an adulterous lover [Old French, literally: through love]

Thesaurus

Noun	1.	paramour - a woman's lover fancy man lover - a significant other to whom you are not related by marriage
	2.	paramour - a woman who cohabits with an important man concubine, courtesan, doxy kept woman, mistress, fancy woman - an adulterous woman; a woman who has an ongoing extramarital sexual relationship with a man odalisque - a woman slave in a harem