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Definition of jet stream noun from the Oxford Advanced Learner's Dictionary

jet stream

noun
 
/ˈdʒet striːm/
 
/ˈdʒet striːm/
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  1. (usually the jet stream)
     [singular] a strong wind that blows high above the earth and that has an effect on the weather
    • The jet stream in the northern hemisphere moves northward.
  2. [countable] the flow of gases from a plane’s engine
See jet stream in the Oxford Advanced American Dictionary
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