emission

 
Pronunciation: /ɪˈmɪʃ(ə)n/

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)