(biblical, strictly) Sexual intercourse by a married person with someone other than their spouse. See more synonyms at Thesaurus:cuckoldry

(biblical, broadly) Lewdness or unchastity of thought as well as act, as forbidden by the sixth/seventh commandment; sinful sexual behavior as a category.

(biblical) Faithlessness in religion.

(ecclesiastical) The intrusion of a person into a bishopric during the life of the bishop.

(political economy) Adulteration; corruption.