Dictionary.net

• The practice of unlawful intercourse with the other sex; fornication; lewdness.

1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.

• n. Practice of unlawful commerce with the other sex ; fornication ; lewdness Scripture, the desertion of the worship of the true God for the worship of idols; idolatry.

1871 - The Cabinet Dictionary of the English Language