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Definition of Air defense

Babylon English

system of defense against attacks (aircraft, missiles, etc.) which come from the air
Air defense Definition from Government Dictionaries & Glossaries
DOD Dictionary of Military Terms
Defensive measures designed to destroy attacking enemy aircraft or missiles in the atmosphere, or to nullify or reduce the effectiveness of such attack. Also called AD. See also active air defense; aerospace defense; passive air defense. (JP 3-01)
  
Source: U.S. Department of Defense, Joint Doctrine Division. ( About )
Air defense Definition from Language, Idioms & Slang Dictionaries & Glossaries
WordNet 2.0

Noun
1. defensive measures designed to destroy attacking enemy aircraft or missiles or to nullify their effectiveness
(hypernym) defense, defence, defensive measure
(hyponym) active air defense