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[ih-mish-uh n] /ɪˈmɪʃ ən/
an act or instance of emitting:
the emission of poisonous fumes.
something that is emitted; discharge; emanation.
an act or instance of issuing, as paper money.
Electronics. a measure of the number of electrons emitted by the heated filament or cathode of a vacuum tube.
an ejection or discharge of semen or other fluid from the body.
Synonyms: ejaculation.
the fluid ejected or discharged.
Synonyms: ejaculate.
Origin of emission
1600-10; (< Middle French) < Latin ēmissiōn- (stem of ēmissiō), equivalent to ēmiss(us), past participle of ēmittere to emit (ē- e-1 + mit- send + -tus past participle suffix) + -iōn- -ion
Related forms
nonemission, noun
reemission, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for emissions
Contemporary Examples
Historical Examples
  • Its emissions must always be in a compound ratio to the fund and the demand.

  • Now, we may say of registers that they are to the larnyx what emissions are to the mouth.

  • When Parliament passed an act to prohibit future emissions in the colonies, they seemed satisfied.

    Give Me Liberty Thomas J. Wertenbaker
  • For this reason women can stand frequently repeated sex relations and emissions or pollutions much better than men can.


    William J. Robinson
  • This circumstance has led certain persons to suppose that emissions are natural and beneficial.

    Plain Facts for Old and Young John Harvey Kellogg
British Dictionary definitions for emissions


the act of emitting or sending forth
energy, in the form of heat, light, radio waves, etc, emitted from a source
a substance, fluid, etc, that is emitted; discharge
a measure of the number of electrons emitted by a cathode or electron gun: at 1000°C the emission is 3 mA See also secondary emission, thermionic emission
(physiol) any bodily discharge, esp an involuntary release of semen during sleep
an issue, as of currency
Derived Forms
emissive, adjective
Word Origin
C17: from Latin ēmissiō, from ēmittere to send forth, emit
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for emissions



early 15c., "something sent forth," from Middle French émission (14c.) and directly from Latin emissionem (nominative emissio) "a sending out, projecting, hurling, letting go, releasing," from past participle stem of emittere "send out" (see emit). Meaning "a giving off or emitting" is from 1610s.

Online Etymology Dictionary, © 2010 Douglas Harper
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emissions in Medicine

emission e·mis·sion (ĭ-mĭsh'ən)
A discharge of fluid from a living body, usually a seminal discharge.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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