Easton's Bible Dictionary
But this word is more frequently used in a symbolical than in its ordinary sense. It frequently means a forsaking of God or a following after idols (Isaiah 1:2; Jeremiah 2:20; Ezek. 16; Hosea 1:2; 2:1-5; Jeremiah 3:8, 9).
Noah Webster's New International Dictionary of the English Language
1. (n.) Unlawful sexual intercourse on the part of an unmarried person; the act of such illicit sexual intercourse between a man and a woman as does not by law amount to adultery.
2. (n.) Adultery.
3. (n.) Incest.
4. (n.) Idolatry.