Definition of the North American Aerospace Defense Command from the Oxford Advanced Learner's Dictionary

 

the North American Aerospace Defense Command

 
BrE
 
; NAmE
 
(abbreviation NORAD)
 
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a military defence organization established in 1957 by the US and Canadian air forces. It has a large underground base in Cheyenne Mountain near Colorado Springs, Colorado, to provide early warning of air attacks.