Air Alert (Noun)
Meaning 1
The time period during which military and civilian agencies are prepared for an enemy air attack.
Classification
Nouns denoting time and temporal relations.
Hypernyms
Meaning 2
The condition in which combat aircraft are airborne and ready for an operation; "aircraft in the Mideast are on air alert".
Classification
Nouns denoting natural processes.
Hypernyms
Meaning 3
The warning signal that begins a period of preparation for an enemy air attack.
Classification
Nouns denoting communicative processes and contents.