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omen (n.)
"casual event or occurrence supposed to portend good or evil," 1580s, from Latin omen "foreboding, augury," according to Varro from Old Latin osmen; a word of unknown origin.
omen (v.)
"to give indication of the future," 1775, from omen (n.). Related: Omened. The Latin verb ominari meant "to know or tell from omens, to predict."