omen (n.)

1580s, from Latin omen "foreboding, augury," supposedly from Old Latin osmen; a word of unknown origin. Attempts have been made to relate it to the root of audire "to hear" [OED], to PIE words meaning "a sighting," and to a PIE root meaning "to believe, hold as true" (source also of Greek oiomai "I suppose, think, believe").

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