English version

paramour

From Longman Dictionary of Contemporary Englishparamourpar‧a‧mour /ˈpærəmʊə $ -mʊr/ noun [countable]  literarySYRELATIONSHIP someone who you have a romantic or sexual relationship with, but who you are not married to syn lover
Examples from the Corpus
paramourThey bade both the merchant and his paramour adieu.
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