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emission

Pronunciation: /ɪˈmɪʃ(ə)n/

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Definition of emission

noun

[mass noun]
  • the production and discharge of something, especially gas or radiation:the effects of lead emission on health [count noun]:cuts in carbon dioxide emissions
  • [count noun] an ejaculation of semen: nocturnal emissions

Origin:

late Middle English (in the sense 'emanation'): from Latin emissio(n-), from emiss- 'sent out', from the verb emittere (see emit)

emission in other Oxford dictionaries

Definition of emission in the US English dictionary