paramour
noun/ˈpærəmʊə(r)/
/ˈpærəmʊr/
(old-fashioned or literary)- a person that somebody is having a romantic or sexual relationship with synonym loverWord OriginMiddle 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.
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paramour