Omen

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late 16th century: from Latin.

wiktionary

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From Latin ōmen(“foreboding, omen”).

etymonline

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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."