warn·ing
[wawr-ning]
1.the act or utterance of one who warns or the existence, appearance, sound, etc., of a thing that warns.
2.something that serves to warn, give notice, or caution: We fired a warning at the intruders.
3.Meteorology . an announcement from the U.S. National weather Service alerting the public that a storm or other weather-related hazard is imminent and that immediate steps should be taken to protect lives and property. Compare advisory ( def. 5 ) , storm warning ( def. 2 ) , watch ( def. 20 ) .
–adjective
4.serving to warn, advise, caution: a warning bell.