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
Made by combining carbon dioxide, water, and renewable electricity, e-SAF can slash an aircraft’s lifecycle emissions by more than 90 percent.
—
Mrigakshi Dixit, Interesting Engineering, 11 June 2026
And then the other is thinking directly about carbon release and applications that involve changing the microbiome in cattle to avoid the emission of methane.
—Quanta Magazine, 11 June 2026
Deforestation is the leading driver of Brazil’s greenhouse gas emissions, which contribute to global warming.
—ABC News, 11 June 2026
Worst of all, funding for these questionable initiatives was originally set by Congress to reduce carbon dioxide emissions.
—Victor Tangermann, Futurism, 11 June 2026
See All Example Sentences for emission
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Mrigakshi Dixit, Interesting Engineering, 11 June 2026
And then the other is thinking directly about carbon release and applications that involve changing the microbiome in cattle to avoid the emission of methane.
—Quanta Magazine, 11 June 2026
Deforestation is the leading driver of Brazil’s greenhouse gas emissions, which contribute to global warming.
—ABC News, 11 June 2026
Worst of all, funding for these questionable initiatives was originally set by Congress to reduce carbon dioxide emissions.
—Victor Tangermann, Futurism, 11 June 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 12 Jun. 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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