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no-fly zone

noun [C]
 
 
/ˌnəʊˈflaɪˌzəʊn/ US  /ˌnoʊˈflaɪˌzoʊn/

Definition

an area above a country that aircraft from other countries may not enter without risking attack: Aircraft will enforce the no-fly zone to protect UN forces on the ground.AviationTravelling by aircraftMovement through the air
(Definition of no-fly zone noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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