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English to English noun
| 1 |
the time period during which military and civilian agencies are prepared for an enemy air attack |  | source: wordnet30
| 2 |
the condition in which combat aircraft are airborne and ready for an operation | | Example: aircraft in the Mideast are on air alert
source: wordnet30
| 3 |
the warning signal that begins a period of preparation for an enemy air attack | | source: wordnet30
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