Webster's Revised Unabridged Dictionary · 1913

Omen

Omen , noun

[Latin omen, the original form being osmen, according to Varro.]

An occurrence supposed to portend, or show the character of, some future event; any indication or action regarded as a foreshowing; a foreboding; a presage; an augury.
Bid go with evil omen, and the brand Of infamy upon my name. — Milton

Omen , transitive verb

To divine or to foreshow by signs or portents; to have omens or premonitions regarding; to predict; to augur; as, to omen ill of an enterprise.
The yet unknown verdict, of which, however, all omened the tragical contents. — Sir W. Scott