A phenomenon supposed to portend good or evil; a prophetic sign.(noun)
Prognostication; portent: birds of ill omen. (noun)
To be a prophetic sign of; portend.(verb-transitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "omen" in a sentence
"Funny how your larpdip after omen is mild, while my larp dip is always the worste after omen."
"Another ill omen is that this past winter was the first in memory that the airlines didn't have dead-of-winter, panicky sales to Europe."
"Century City airs Tuesdays (how much of a good omen is that?) at 9: 00 pm EST on CBS ... and starts March 16th."