Portent

n.

1.

That which portends, or foretoken; esp., that which portends evil; a sign of coming calamity; an omen; a sign. My loss by dire portents the god foretold. - Dryden.

Noun

1.

portent - a sign of something about to happen; "he looked for an omen before going into battle" Synonyms: omen, prognostic, prognostication, presage, prodigy

adumbration, advance notice, augury, auspice, balefulness, banefulness, betokening, betokenment, bodefulness, boding, direness, doomfulness, fatality, fatefulness, foreboding, foreshadow, foreshadowing, foreshowing, foretoken, foretokening, forewarning, indicant, indication, marvel, meaning, miracle, omen, ominousness, phenomenon, plenty of notice, portentousness, precautioning, prefiguration, preindication, premonition, premonitory shiver, premonitory sign, premonitory symptom, prenotice, prenotification, presage, presagefulness, presentiment, presignifying, prewarning, prodigy, prognostic, prognostication, promise, sensation, shadow, sign, significance, sinisterness, soothsay, stunner, suggestiveness, token, tokening, type