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Definition of the troposphere noun from the Oxford Advanced American Dictionary

 

the troposphere

 noun
noun
NAmE//ˈtroʊpəˌsfɪr//
 
, NAmE//ˈtrɑpəˌsfɪr//
 
[singular] (technology)
 
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the lowest layer of the earth's atmosphere, between the surface of the earth and about 4-12 miles above the surface
See the troposphere in the Oxford Advanced Learner's Dictionary
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