omen

Short definition from Wiktionary

Noun

1. 1
   Something which portends or is perceived to portend either a good or evil event or circumstance in the future, or which causes a foreboding; a portent or augury.
2. 2
   A thing of prophetic significance.

Verb

1. 1
   To be an omen of.
2. 2
   To divine or predict from omens.