adultery

noun7

1. •
   Sexual intercourse by a married person with someone other than their spouse. See more synonyms at Thesaurus:cuckoldry

   • She engaged in adultery because her spouse has a low libido, while hers is very high.
2. •
   Lewdness or unchastity of thought as well as act, as forbidden by the sixth/seventh commandment; sinful sexual behavior as a category.

   • Thou shalt not commit adultery.
3. •
   Faithlessness in religion.

   • And it came to pass through the lightness of her whoredom, that she defiled the land, and committed adultery with stones and with stocks. — 1611
4. •
   Adulteration; corruption.
5. •
   The intrusion of a person into a bishopric during the life of the bishop.
6. •
   (no longer used) Injury; degradation; ruin.

   • […] you might wrest the Caduceus out of my hand, to the adultery and spoil of Nature […] — 1616
7. •
   (no longer used) The fine and penalty formerly imposed for the offence of adultery.