an illicit lover, especially of a married person.
any lover.

1250–1300; Middle English, from the phrase par amour by or through love < Old French Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
paramour (ˈpærəˌmʊə)
1.  derogatory chiefly a lover, esp an adulterous woman
2.  an archaic word for beloved
[C13: from Old French, literally: through love]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1300, noun use of adv. phrase par amour (c.1300) "passionately, with strong love or desire," from Anglo-Fr. par amour, from acc. of amor "love," from amare "to love" (see Amy). Originally a term for Christ (by women) or the Virgin Mary (by men), it came to mean "darling, sweetheart"
(c.1350) and "mistress, concubine, clandestine lover" (late 14c.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The student and her paramour lost valuable credibility.
Onlookers watch as Michael switches on his digital paramour.
It was also where she found her peppy young paramour.
The latest appointment was announced last month, in what some call the case of
  the poisoned paramour.
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