Definition of paramour in English:

paramour

noun

Archaic
  • A lover, especially the illicit partner of a married person.

    • ‘He informed her that her paramour was already married and as per the Shariah rules he can have another wife only if he can do justice to his first wife.’
    • ‘He is in trouble again for sharing his largesse with two young paramours that he claimed to have ditched in favor of his wife and four kids.’
    • ‘Is it too much to have these characters actually act like fathers and daughters, and not just like rich, sleazy sugar daddies with their young, illicit paramours tagging along for the ride?’
    • ‘And one set of civil servants was able to keep tabs on their boss only by asking his official driver which of his paramours ' flats he had been parked outside that day.’
    • ‘Alas, when the desired moment of assignation arrives, his beloved paramour is not to be found, and another girl offers to fill her place.’

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.

Pronunciation:

paramour

/ˈparəmʊə/