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. ejaculation.
the fluid ejected or discharged. ejaculate.

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

nonemission, noun
reemission, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
emission (ɪˈmɪʃən)
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.  secondary emission See also thermionic emission a measure of the number of electrons emitted by a cathode or electron gun: at 1000°C the emission is 3 mA
5.  physiol any bodily discharge, esp an involuntary release of semen during sleep
6.  an issue, as of currency
[C17: from Latin ēmissiō, from ēmittere to send forth, emit]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1607, from L. emissionem (nom. emissio) "a sending out," from emiss-, stem of emittere "send out" (see emit).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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Example sentences
Every electric system is different, with different marginal costs and sulfur
  dioxide emission rates for on- and off-peak periods.
Methane is a major emission from coal plants and agricultural processes.
During these experiments technicians measure both emission levels and fuel
So until the they are cooled the radiation emission will continue.
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