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air alert is a noun meaning "the time period during which military and civilian agencies are prepared for an enemy air attack". It carries 3 recorded senses.
the time period during which military and civilian agencies are prepared for an enemy air attack
the condition in which combat aircraft are airborne and ready for an operation
“aircraft in the Mideast are on air alert”
the warning signal that begins a period of preparation for an enemy air attack
Definitions, synonyms and semantic relations for air alert come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.