The meaning of Adultery in the Bible
(From Easton's Bible Dictionary)

conjugal infidelity. An adulterer was a man who had illicit intercourse with a married or a betrothed woman, and such a woman was an adulteress. Intercourse between a married man and an unmarried woman was fornication. Adultery was regarded as a great social wrong, as well as a great sin.

See more on the meaning of Adultery in the Bible:
Adultery {International Standard Bible Encyclopedia}

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