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 Among the benefits are the reduction of carbon emissions and improved air quality — even improved mental and physical health. London Gibson, Indianapolis Star, "Indianapolis building gets highest 'green' building certification possible," 29 Nov. 2019 Air travel is one of the leading sources of carbon emissions. Ashley Boucher, PEOPLE.com, "Bella Hadid Paying to Have 600 Trees Planted to Help Reduce Her Carbon Footprint from Air Travel," 28 Nov. 2019 By the middle of the century, climate models estimate average temperatures in Oman will be 3 or 4 degrees hotter that the historical average, depending on the scenario of planet-heating carbon emissions. Ian James, azcentral, "Ancient aqueducts in Oman imperiled by modern wells and climate change," 28 Nov. 2019 The fashion industry produces 20% of global wastewater and 10% of global carbon emissions, according to the U.N. Environment Programme. Laura Pitcher, Teen Vogue, "Why Some Brands Are Taking a Stand Against Black Friday," 27 Nov. 2019 According to the International Air Transport Association, flights were responsible for 2.4 percent of global energy-related carbon dioxide emissions in 2018. Heather Hansman, Outside Online, "How to Go Green on Black Friday," 26 Nov. 2019 Australia only accounts for 1.3% of global emissions when calculating the carbon dioxide released within the country. Rachael Bunyan, Time, "Koalas Were Already on the Brink in Australia. Bushfires Have Killed 1,000 in 2 Months, Experts Say," 26 Nov. 2019 It’s estimated that about 60 percent of methane emissions come from human activities, such as from landfills, cattle breeding and certain types of agriculture, while the other 40 percent comes from natural sources. Denise Chow, NBC News, "Carbon dioxide in Earth's atmosphere reaches record high, researchers say," 25 Nov. 2019 Governments are key Of the 27 fossil fuel-producing countries, the top nine account for over two-thirds of global fossil fuel CO2 emissions, the report says. Stephen Leahy, National Geographic, "Dangerous levels of warming locked in by planned jump in fossil fuels output," 20 Nov. 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

2 Dec 2019

Cite this Entry

“Emission.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/emissive. Accessed 5 December 2019.

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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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