Warning
Water
The fourth of five Early Warning System components consisting of the processes (including the media) and equipment necessary to make the public aware of potential, probable, or imminent danger or risk. A warning should be designed to prompt the population at risk to take protective action.
Weather
A warning is issued when a hazardous weather or hydrologic event is occurring, is imminent, or has a very high probability of occurring. A warning is used for conditions posing a threat to life or property.
Java
A SAX parser warning is generated when the document's DTD contains duplicate definitions and in similar situations that are not necessarily an error but which the document author might like to know about, because they could be. See also fatal error, error.
Perl
A message printed to the "STDERR" stream to the effect that something might be wrong but isn't worth blowing up over. See "warn" in perlfunc and the warnings pragma.