The definition of adultery is sexual intercourse by a married person with someone other than his or her spouse.(noun)
Tiger Woods is an example of someone who committed adultery.
See adultery in Webster's New World College Dictionary
noun pl. adulteries
Origin: L adulterium < adulter: see adulterate
See adultery in American Heritage Dictionary 4
noun pl. a·dul·ter·ies
Origin: Middle English
Origin: , from Old French adultere
Origin: , from Latin adulterium
Origin: , from adulter, adulterer; see adulterate.
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