(First of two entries.) He had been warned about his sickness. 2: something that warns or serves to warn, particularly a notification or bulletin informing the public of an impending peril (such as a tornado, thunderstorm, or flood). 3: a cautionary remark, instruction, or example. 4: a notice posted by a government authority in some public places containing information about some law or regulation. Warnings are often given to alert people about potential dangers that may not be obvious immediately. For example, when there is a severe weather warning for your area, you should check the local news and radio stations to see if warnings have been issued for your location. Also, keep in mind that warnings can change quickly depending on the circumstances, so please pay close attention to updates from emergency management officials. In the early days of aviation, warnings were often given by flagpole pennants being raised over airports to indicate bad weather approaching. Today's warnings are given via air traffic control, marine radar, satellite imagery, and other means. The word "warning" has many different meanings, but they all relate to danger or opportunity. So, when you hear or see this word used in context with another event, understand its meaning before making any judgments about what happened or will happen next.