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
This reduces reverse logistics costs, eliminates unnecessary carbon emissions and ensures those items serve a purpose locally.
—
Sarah Jones, Sourcing Journal, 3 Feb. 2026
Carbon markets are increasingly reflecting regional policy decisions rather than global changes in emissions, new research showed.
—Natasha Bracken, semafor.com, 3 Feb. 2026
The program targets a 20 percent improvement in fuel efficiency compared with current engines, a key goal as airlines face rising fuel costs and tighter emissions requirements.
—Sujita Sinha, Interesting Engineering, 2 Feb. 2026
These X-ray emissions mark the earliest cosmic detection of intracluster heating and virialization.
—Big Think, 2 Feb. 2026
See All Example Sentences for emission
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Sarah Jones, Sourcing Journal, 3 Feb. 2026
Carbon markets are increasingly reflecting regional policy decisions rather than global changes in emissions, new research showed.
—Natasha Bracken, semafor.com, 3 Feb. 2026
The program targets a 20 percent improvement in fuel efficiency compared with current engines, a key goal as airlines face rising fuel costs and tighter emissions requirements.
—Sujita Sinha, Interesting Engineering, 2 Feb. 2026
These X-ray emissions mark the earliest cosmic detection of intracluster heating and virialization.
—Big Think, 2 Feb. 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 6 Feb. 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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