Adultery

Definition:

(n.) The unfaithfulness of a married person to the marriage bed; sexual intercourse by a married man with another than his wife, or voluntary sexual intercourse by a married woman with another than her husband.
(n.) Adulteration; corruption.
(n.) Lewdness or unchastity of thought as well as act, as forbidden by the seventh commandment.
(n.) Faithlessness in religion.
(n.) The fine and penalty imposed for the offense of adultery.
(n.) The intrusion of a person into a bishopric during the life of the bishop.
(n.) Injury; degradation; ruin.

Compare adultery with other words:

adultery vs. fornicate