adultery
US /əˈdʌl.tɚ.i/
UK /əˈdʌl.tɚ.i/

1.
adultère
voluntary sexual intercourse between a married person and a person who is not their spouse.
:
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The couple's marriage ended due to an act of adultery.
Le mariage du couple a pris fin à cause d'un acte d'adultère.
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In some cultures, adultery is considered a serious crime.
Dans certaines cultures, l'adultère est considéré comme un crime grave.