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1. Being in violation of marriage vows; adulterous: an extramarital affair.
2. Having to do with a person other than one's spouse: an extramarital friendship.
(esp of sexual relations) occurring outside marriage
ex•tra•mar•i•tal(ˌɛk strəˈmær ɪ tl)
pertaining to sexual relations with someone other than one's spouse: extramarital affairs.
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|Adj.||1.||extramarital - characterized by adultery; "an adulterous relationship"; "extramarital affairs"; "the extracurricular activities of a philandering husband"|
illicit - contrary to accepted morality (especially sexual morality) or convention; "an illicit association with his secretary"