Simple Definition of adultery
: sex between a married person and someone who is not that person's wife or husband
Full Definition of adultery
: voluntary sexual intercourse between a married man and someone other than his wife or between a married woman and someone other than her husband; also : an act of adultery
Examples of adultery
He found out that his wife had committed adultery.
She accused her husband of adultery.
Origin of adultery
Middle English, alteration of avoutrie, from Anglo-French avulterie, from Latin adulterium, from adulter adulterer, back-formation from adulterare
First Known Use: 15th century
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