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English definition of “emission”

emission

noun uk   /ɪˈmɪʃ.ən/ us  
C1 [U] the act of sending out gas, heat, light, etc.: Environmental groups want a substantial reduction in the emission of greenhouse gases. C1 [C] an amount of gas, heat, light, etc. that is sent out: carbon dioxide emissions
(Definition of emission from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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