ଅର୍ଥ : The time period during which military and civilian agencies are prepared for an enemy air attack.
ଅର୍ଥ : The condition in which combat aircraft are airborne and ready for an operation.
ଉଦାହରଣ :
Aircraft in the Mideast are on air alert.
ଅର୍ଥ : The warning signal that begins a period of preparation for an enemy air attack.