emission

[ ih-mish-uh n ]
/ ɪˈmɪʃ ən /

noun

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.
the fluid ejected or discharged.

Nearby words

  1. emir,
  2. emirate,
  3. emiscan,
  4. emissary,
  5. emissary vein,
  6. emission nebula,
  7. emission spectrum,
  8. emissive,
  9. emissivity,
  10. emit

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 formsnon·e·mis·sion, nounre·e·mis·sion, noun

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for emission


British Dictionary definitions for emission

emission

/ (ɪˈmɪʃən) /

noun

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 gunat 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 Formsemissive, adjective

Word Origin for emission

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

Word Origin and History for emission

emission

n.

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

Medicine definitions for emission

emission

[ ĭ-mĭshən ]

n.

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.