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
Dictionary.com Unabridged
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
These are the greenhouse-gas emissions from two universities.
Emissions and pollution are a key concern with traditional power sources.
Emissions from the ships' smokestacks have particles that cause water vapor to
  condense as clouds.
Everyone knows easing up on the accelerator can improve your fuel economy and
  reduce your emissions.
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