Definition of Aerospace defense

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Aerospace defense Definition from Government Dictionaries & Glossaries
DOD Dictionary of Military Terms
1. All defensive measures designed to destroy or nullify attacking enemy aircraft and missiles and also negate hostile space systems. 2. An inclusive term encompassing air defense, ballistic missile defense, and space defense. See also air defense; space defense. (JP 3-27)
  
Source: U.S. Department of Defense, Joint Doctrine Division. ( About )