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
Electromagnetic emissions from flares travel at light speed and therefore reach Earth in around eight minutes.
—
Literary Hub, 27 Oct. 2025
But the appeal of trains goes deeper than simple emissions statistics.
—Chelsea Haney
october 25, New Atlas, 25 Oct. 2025
The astronomical energy demand for data centers has raised environmental concerns about AI as tech companies draw more electricity and drive up emissions from fossil fuel generation.
—Jeff Young, MSNBC Newsweek, 24 Oct. 2025
Microfiber emissions remain an important area where knowledge still needs building, along with biodiversity and ecosystem rejuvenation, and community resilience.
—Mayu Saini, Sourcing Journal, 24 Oct. 2025
See All Example Sentences for emission
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Literary Hub, 27 Oct. 2025
But the appeal of trains goes deeper than simple emissions statistics.
—Chelsea Haney
october 25, New Atlas, 25 Oct. 2025
The astronomical energy demand for data centers has raised environmental concerns about AI as tech companies draw more electricity and drive up emissions from fossil fuel generation.
—Jeff Young, MSNBC Newsweek, 24 Oct. 2025
Microfiber emissions remain an important area where knowledge still needs building, along with biodiversity and ecosystem rejuvenation, and community resilience.
—Mayu Saini, Sourcing Journal, 24 Oct. 2025
See All Example Sentences for emission
Cite this Entry
“Emission.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/emission. Accessed 31 Oct. 2025.
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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