anything perceived or happening that is believed to portend a good or evil event or circumstance in the future; portent.

a prognostic.

prophetic significance; presage

a bird of ill omen.

to be an omen of; portend.

to divine, as if from omens.

noun

augury , auspice , bodement , boding , foreboding , foretoken , harbinger , indication , portent , premonition , presage , prognostic , prognostication , prophecy , straw , warning , writing on the wall *notes:omen has a negative connotation , a connotation absent from the word augury ; generally , augury bodes well for the future , an omen bodes illa harbinger is an indication of the approach of something or someone; a messenger is a person who carries a communications or performs an errand; an omen is a sign of something about to happen , forerunner , prefigurement , sign , bode , divination , forebode , foreshadow , handwriting on the wall , precursor , prediction , presentiment , token