emis·​sion | \ ē-ˈmi-shən How to pronounce emission (audio) \

Definition of emission

1a : an act or instance of emitting : emanation
b archaic : publication
c : a putting into circulation
2a : something sent forth by emitting: such as
(1) : electromagnetic radiation from an antenna or a celestial body
(2) usually emissions : substances discharged into the air (as by a smokestack or an automobile engine)
b : effluvium

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Other Words from emission

emissive \ ē-​ˈmi-​siv How to pronounce emission (audio) \ adjective

Examples of emission in a Sentence

trying to reduce the emission of greenhouse gases
Recent Examples on the Web That’s why the funds from the settlement have to go toward replacing diesel emission sources with cleaner technology. Sarah Bowman, The Indianapolis Star, 20 July 2021 The European giant, whose main stakeholders are the French, Spanish and German governments, has announced plans to develop carbon-neutral planes within five years and recently unveiled a zero-emission concept aircraft that runs on hydrogen. New York Times, 14 July 2021 And as a way of proving this, Kuniskis revealed that the automaker’s first EV will be a zero-emission muscle car. Bryan Hood, Robb Report, 9 July 2021 Jeep promises a zero-emission 4xe model in every SUV segment by 2025. Eric Stafford, Car and Driver, 8 July 2021 Moreover, the entire complexion of this market could change if governments start establishing more rigorous mandates around carbon emission limits. Rob Toews, Forbes, 20 June 2021 The legislation would direct the Environmental Protection Agency to set methane emission limits for oil and gas facilities, but allow the owners to figure out how to meet the standard. Michael Smolens Columnist, San Diego Union-Tribune, 28 Apr. 2021 The proposal relies on a smaller amount of money from proceeds of the state’s cap-and-trade program, in which companies pay for greenhouse-gas-emission credits. John Myers, Los Angeles Times, 8 Apr. 2021 One central component of the wide-reaching bill is a clean electricity standard, that allows for power companies to trade zero-emission electricity credits amongst themselves to comply with its mandates. Kate Aronoff, The New Republic, 23 Mar. 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'emission.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of emission

1607, in the meaning defined at sense 1a

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Time Traveler for emission

Time Traveler

The first known use of emission was in 1607

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Dictionary Entries Near emission



emission line

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Statistics for emission

Last Updated

23 Jul 2021

Cite this Entry

“Emission.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/emission. Accessed 30 Jul. 2021.

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More Definitions for emission



English Language Learners Definition of emission

: the act of producing or sending out something (such as energy or gas) from a source
: something sent out or given off


emis·​sion | \ ē-ˈmi-shən How to pronounce emission (audio) \

Kids Definition of emission

1 : the act of giving off The energy plant is reducing the emission of harmful gases.
2 : something that is given off Scientists can record radio emissions from far-off stars.


emis·​sion | \ ē-ˈmish-ən How to pronounce emission (audio) \

Medical Definition of emission

1 : an act or instance of emitting
2a : something sent forth by emitting: as
(1) : electrons discharged from a surface
(2) : electromagnetic waves radiated by an antenna or a celestial body
(3) : substances and especially pollutants discharged into the air (as by a smokestack or an automobile gasoline engine)
b : a discharge of fluid from a living body especially : ejaculate — see nocturnal emission


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