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⇱ emission - WordReference.com Dictionary of English

emission

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UK:**UK and possibly other pronunciationsUK and possibly other pronunciations/ɪˈmɪʃən/US:USA pronunciation: IPA and respellingUSA pronunciation: IPA/ɪˈmɪʃən/ ,USA pronunciation: respelling(i mish′ən)


WordReference Random House Unabridged Dictionary of American English © 2026
e•mis•sion  (i mish′ən),USA pronunciation n. 
  1. an act or instance of emitting:the emission of poisonous fumes.
  2. something that is emitted;
    discharge;
    emanation.
  3. an act or instance of issuing, as paper money.
  4. Electronicsa measure of the number of electrons emitted by the heated filament or cathode of a vacuum tube.
  5. Physiologyan ejection or discharge of semen or other fluid from the body.
  6. Physiologythe fluid ejected or discharged.
  • Latin ēmissiōn- (stem of ēmissiō), equivalent. to ēmiss(us), past participle of ēmittere to emit (ē- e- + mit- send + -tus past participle suffix) + -iōn- -ion
  • Middle French)
  • (1600–10
    5. ejaculation. 6. ejaculate.
Collins Concise English Dictionary © HarperCollins Publishers::
emission /ɪˈmɪʃən/ n
  1. the act of emitting or sending forth
  2. energy, in the form of heat, light, radio waves, etc, emitted from a source
  3. a substance, fluid, etc, that is emitted; discharge
  4. a measure of the number of electrons emitted by a cathode or electron gun
    See also secondary emission, thermionic emission
  5. any bodily discharge, esp an involuntary release of semen during sleep
Etymology: 17th Century: from Latin ēmissiō, from ēmittere to send forth, emiteˈmissive adj
WordReference Random House Learner's Dictionary of American English © 2026
e•mit /ɪˈmɪt/USA pronunciation   v. [~ + object], e•mit•ted, e•mit•ting. 
  1. to send forth (liquid, light, particles, etc.); discharge:The fireplace emitted a pleasant warmth.
  2. to utter (a sound): to emit a cry.
e•mis•sion /ɪˈmɪʃən/USA pronunciation  n. [countable* uncountable]See -mit-.

WordReference Random House Unabridged Dictionary of American English © 2026
e•mit  (i mit′),USA pronunciation v.t., e•mit•ted, e•mit•ting. 
  1. to send forth (liquid, light, heat, sound, particles, etc.);
    discharge.
  2. to give forth or release (a sound):He emitted one shrill cry and then was silent.
  3. to utter or voice, as opinions.
  4. to issue, as an order or a decree.
  5. to issue formally for circulation, as paper money.
  • Latin ēmittere to send forth, equivalent. to ē- e- + mittere to send
  • 1620–30

'emission' also found in these entries (note: many are not synonyms or translations):

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