Definition of paramour noun from the Oxford Advanced Learner's Dictionary

 

paramour

 noun
noun
BrE BrE//ˈpærəmʊə(r)//
 
; NAmE NAmE//ˈpærəmʊr//
 
(old-fashioned or literary)
 
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a person that somebody is having a romantic or sexual relationship with synonym lover Word Origin Middle English: from Old French par amour ‘by love’; in English the phrase was written from an early date as one word and came to be treated as a noun.
See the Oxford Advanced American Dictionary entry: paramour