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1. (Military) the condition in which combat aircraft are airborne and ready for an operation
2. (Military) a signal to prepare for this
See: airborne alert; air defense warning conditions; alert; ground alert.
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|Noun||1.||air alert - the time period during which military and civilian agencies are prepared for an enemy air attack|
|2.||air alert - the condition in which combat aircraft are airborne and ready for an operation; "aircraft in the Mideast are on air alert"|
|3.||air alert - the warning signal that begins a period of preparation for an enemy air attack|