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Definition of Air defense emergency

Air defense emergency Definition from Government Dictionaries & Glossaries
DOD Dictionary of Military Terms
An emergency condition, declared by the Commander in Chief, North American Air Defense Command, that exists when attack upon the continental United States, Alaska, Canada, or United States installations in Greenland by hostile aircraft or missiles is considered probable, is imminent, or is taking place. Also called ADE.
  
Source: U.S. Department of Defense, Joint Doctrine Division. ( About )