American English

Definition of airspace noun from the Oxford Advanced American Dictionary

 

airspace

 noun
noun
NAmE//ˈɛrspeɪs//
 
[uncountable]
 
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the part of the sky where planes fly, usually the part above a particular country that is legally controlled by that country The airspace over Europe is becoming more and more crowded. The jet entered American airspace without permission.
See the Oxford Advanced Learner's Dictionary entry: airspace