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English word omen comes from Latin osmen, which itself is of uncertain origin but possibly comes from a combination of Latin os ("mouth") with Latin -men (forms neuter nouns of the third declension.)
os (Latin)
Mouth. (poetic) speech. Face, appearance, head. Opening, entrance Bone. Framework of discourse. Heartwood. The hard or innermost part of trees or fruits.
-men (Latin)
Forms neuter nouns of the third declension.
osmen (Latin)
An omen.
omen (Latin)
An omen.
omen (English)
(intransitive) To divine or predict from omens.. (transitive) To be an omen of. Something which portends or is perceived to portend a good or evil event or circumstance in the future; an augury or foreboding.. Prophetic significance.