emission
noun
emis·sion
ē-ˈmi-shən 
1
a
: an act or instance of emitting : emanation
b
archaic
: publication
c
: a putting into circulation
2
a
: 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
Examples of emission in a Sentence
trying to reduce the emission of greenhouse gases
Recent Examples on the Web
The show even features an indoor electric vehicle test track since EVs don't produce carbon emissions.
—
Charles Singh, USA Today, 31 Mar. 2026
Because most ozone-depleting substances are also potent greenhouse gases, the treaty’s measures from 1990 to 2010 alone have prevented the equivalent of 11 gigatons of CO2 emissions into the atmosphere per year.
—Big Think, 31 Mar. 2026
Although expanding, solar and wind power have not yet been enough to halt, let alone reverse, increasing emissions.
—Georgina Jedikovska, Interesting Engineering, 31 Mar. 2026
Congress passed this requirement knowing that the technology to cut emissions wasn’t ready for prime time.
—Ann E. Carlson, The Conversation, 31 Mar. 2026
See All Example Sentences for emission
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Charles Singh, USA Today, 31 Mar. 2026
Because most ozone-depleting substances are also potent greenhouse gases, the treaty’s measures from 1990 to 2010 alone have prevented the equivalent of 11 gigatons of CO2 emissions into the atmosphere per year.
—Big Think, 31 Mar. 2026
Although expanding, solar and wind power have not yet been enough to halt, let alone reverse, increasing emissions.
—Georgina Jedikovska, Interesting Engineering, 31 Mar. 2026
Congress passed this requirement knowing that the technology to cut emissions wasn’t ready for prime time.
—Ann E. Carlson, The Conversation, 31 Mar. 2026
See All Example Sentences for emission
Cite this Entry
“Emission.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/emission. Accessed 4 Apr. 2026.
Copy CitationKids Definition
emission
noun
emis·sion
ē-ˈmish-ən
1
: an act or instance of emitting
2
: something emitted or discharged
Medical Definition
emission
noun
emis·sion
ē-ˈmish-ən
1
: an act or instance of emitting
2
a
: 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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