adultery

/əˈdʌltəri/
noun
  1. Voluntary sexual intercourse between a married person and someone who is not their spouse.
    • Adultery was once considered a crime in many countries.
    • The couple's marriage ended after one partner committed adultery.
    • Many religions forbid adultery as a moral sin.
Antonyms
What does "adultery" mean? | whatsthatwordmean | whatsthatwordmean