Fornication

Nuttall's Standard Dictionary of the English Language · 1890 · p. 83

for-ne-ka -shun, s. sexual intercourse between unmarried persons; the criminal conversation of a married man with an an unmarried woman; adultery; incest; idolatry, or a forsaking of the trueGod, and worshipping of idols; an arching; the forming of a vault [Arch.]