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 partnership resulted in the implementation of energy efficiency measures across the HVAC and lighting systems that are projected to reduce carbon emissions by an amount equivalent to avoiding the import of approximately 7,200 barrels of oil.
—
Condé Nast, Condé Nast Traveler, 4 June 2026
His bill to make Massachusetts’ 2030 emissions target non-binding, cut funding for clean energy programs, and mitigate the effect of climate policies on utility bills passed the House of Representatives last month.
—Jennifer Nassour, Boston Herald, 4 June 2026
Coal fuel is a major producer of greenhouse gas emissions, chiefly carbon dioxide, driving climate change.
—Dan Vergano, Scientific American, 4 June 2026
Using more water can save money and reduce emissions for big tech companies by reducing the power needed for cooling that relies on energy-intensive pumps to recirculate water.
—Ashley Belanger, ArsTechnica, 4 June 2026
See All Example Sentences for emission
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show current usage.
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Condé Nast, Condé Nast Traveler, 4 June 2026
His bill to make Massachusetts’ 2030 emissions target non-binding, cut funding for clean energy programs, and mitigate the effect of climate policies on utility bills passed the House of Representatives last month.
—Jennifer Nassour, Boston Herald, 4 June 2026
Coal fuel is a major producer of greenhouse gas emissions, chiefly carbon dioxide, driving climate change.
—Dan Vergano, Scientific American, 4 June 2026
Using more water can save money and reduce emissions for big tech companies by reducing the power needed for cooling that relies on energy-intensive pumps to recirculate water.
—Ashley Belanger, ArsTechnica, 4 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 9 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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