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)

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Other Words from emission

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

Examples of emission in a Sentence

trying to reduce the emission of greenhouse gases
Recent Examples on the Web Truth be known, the Front Range has made great strides in air quality from the brown cloud days of yesteryear through proper regulations and vehicle emissions standards. Dp Opinion, The Denver Post, "Letters: UN climate talks disappoint, but don’t give up; Pollution and air quality are a top priority; The wisdom or folly of impeaching Donald Trump (12/22/19)," 23 Dec. 2019 The statement noted that the state was still committed to lowering emissions by 25% by 2020. Katherine Dunn, Fortune, "Climate Change Litigation Enters a New Era as Court Rules That Emissions Reduction Is a Human Right," 20 Dec. 2019 Officials at the time said one reason behind making the change was to lower carbon emissions. oregonlive, "Portland reapproves city policy to limit size of new, existing fossil fuel terminals," 18 Dec. 2019 While the guts of the ships are open, Windstar is replacing seven outdated engines with four new Wartsila engines that will meet the International Maritime Organization’s tougher emissions standards. Fran Golden / Bloomberg, Time, "Why Do Cruise Lines Keep Cutting Their Ships in Half?," 6 Dec. 2019 As part of Volkswagen’s 2017 settlement with the U.S. Department of Justice, the company agreed to pay out a total of $15 billion for violating emissions standards. Forum News Service, Twin Cities, "Minnesota pledges additional $15M to electric vehicles; money from Volkswagen settlement," 20 Nov. 2019 The next round of tougher emissions standards goes into effect in 2020. Roy Berendsohn, Popular Mechanics, "The Ultimate Guide To Cutting and Splitting Firewood," 6 Nov. 2019 In response, the Trump administration revoked the waiver that allows California to set its own emissions standard. Kate Cox, Ars Technica, "White House backing off efficiency standard it’s suing over, report says," 1 Nov. 2019 California's authority to set its own, tougher emissions standards goes back to a waiver issued by Congress during passage of the Clean Air Act in 1970. Tom Krisher And Ellen Knickmeyer, Detroit Free Press, "GM, FCA sides with Trump in legal fight with Calif. over gas emissions, fuel standards," 29 Oct. 2019

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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Statistics for emission

Last Updated

14 Jan 2020

Cite this Entry

“Emission.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/emission. Accessed 19 January 2020.

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More Definitions for emission


How to pronounce emission (audio)

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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Comments on emission

What made you want to look up emission? Please tell us where you read or heard it (including the quote, if possible).


to insert between existing elements

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