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 The House is also considering a $1.5 trillion stimulus bill that would include $100 billion for transit issues (including electric buses), $70 billion for electric vehicles and grid improvements and $4.5 billion for zero-emission postal trucks. Breanna T Bradham, Bloomberg.com, "Drastic Covid-19 Slowdown May Hinder Any Green Recovery," 1 July 2020 California last week adopted the first regulation in the world aimed at boosting sales of zero-emission trucks, marking a milestone in the history of regulating pollution from motor vehicles. Maxine Joselow, Scientific American, "California Passes Historic Clean Truck Rule," 29 June 2020 Amazon has also invested in electric vehicle company Rivian, potentially putting the pieces together for a fleet of self-driving zero-emission trucks to deliver the millions of items people order from the company each year. Sebastian Blanco, Car and Driver, "Amazon Buys Autonomous Tech Company Zoox, and Elon Musk Is Amused," 29 June 2020 China now has its own zero-emission heavy-duty vehicle regulation in the works. Michael J. Coren, Quartz, "California is creating America’s largest market for electric trucks," 25 June 2020 The affected policies cover issues including industrial and vehicular emission standards, the protection of nature reserves, and the need for federal infrastructure projects to plan for the long-term fallout of climate change. Eamon Barrett, Fortune, "Two-thirds of Americans think the U.S. government is failing on climate change," 25 June 2020 The rules would require a certain percentage of work truck sales each year to be zero emission vehicles. Washington Post, "California considers 1st-in-US electric truck sales rule," 25 June 2020 The study also found that fabric softener reduced microfiber emission by 35 percent for the opposite reason: reducing friction between fibers. Matt Simon, Wired, "Who's to Blame for Plastic Microfiber Pollution?," 22 June 2020 The largest source of high-speed rail funding, revenue from the state’s cap-and-trade program, has plummeted as fewer businesses are buying emission credits during the economic recession and stay-at-home restrictions. Dustin Gardiner, SFChronicle.com, "California’s bullet train project faces unprecedented woes," 22 June 2020

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

10 Jul 2020

Cite this Entry

“Emission.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/emission. Accessed 11 Jul. 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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