paramour

[ par-uh-moo r ]

/ ˈpær əˌmʊər /

an illicit lover, especially of a married person.

any lover.

Origin of paramour

1250–1300; Middle English, from the phrase par amour by or through love < Old French

Sadly, he had to leave his paramour behind in the Sunshine State.

Jersey Shore Season 3 Premieres: Where We Left Off |The Daily Beast |January 5, 2011 |DAILY BEAST
South Carolina Governor Mark Sanford spent last weekend in Florida with Maria Belen Chapur, his Argentinian paramour.

Mark Sanford Is a Romantic Hero |Ben Crair |June 26, 2009 |DAILY BEAST
Some say simply because a paramour of his own had praised the boy's beauty and said his bride was a woman to be envied.

Cyropaedia |Xenophon
The marriage was a secret one, and Juliet would not have Romeo, if seen, supposed to be a paramour visiting her by night.

Shakespeare's Tragedy of Romeo and Juliet |William Shakespeare

Win her, I'll grant you my permission, for your paramour; and if you do, I'll give her to you for your own.

Wager of Battle |Henry William Herbert
It is the restoration of materialism with its paramour, obsequious art.

Art |Clive Bell
Moreover a mistress does not read Hebrew in a National Library with her paramour.

The Lake |George Moore

paramour

/ (ˈpærəˌmʊə) /

mainly derogatory a lover, esp an adulterous woman

an archaic word for beloved (def. 2)

C13: from Old French, literally: through love