air alert

1. (Military) the condition in which combat aircraft are airborne and ready for an operation

2. (Military) a signal to prepare for this

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

air alert

See: airborne alert; air defense warning conditions; alert; ground alert.

Dictionary of Military and Associated Terms. US Department of Defense 2005.

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Noun	1.	air alert - the time period during which military and civilian agencies are prepared for an enemy air attack period, period of time, time period - an amount of time; "a time period of 30 years"; "hastened the period of time of his recovery"; "Picasso's blue period"
	2.	air alert - the condition in which combat aircraft are airborne and ready for an operation; "aircraft in the Mideast are on air alert" alert, qui vive - condition of heightened watchfulness or preparation for action; "bombers were put on alert during the crisis"
	3.	air alert - the warning signal that begins a period of preparation for an enemy air attack alarum, warning signal, alarm, alert - an automatic signal (usually a sound) warning of danger

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