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

: effluvium

emissive

ē-ˈmi-siv 

adjective

Examples of emission in a Sentence

trying to reduce the emission of greenhouse gases

Recent Examples on the Web

As a result, embodied emissions, e-waste, and the administrative burden of the conventional hardware refresh cycle are greatly reduced. —Thomas Coughlin, Forbes.com, 15 Sep. 2025

That’s Liberty and the oil industry aim to survive for longer—fewer trucks, fewer rigs and fleets, fewer people, fewer emissions—fewer of everything, while producing the same or greater results. —Jordan Blum, Fortune, 14 Sep. 2025

Troublingly, Cal Fire’s flawed models systematically underestimate logging emissions and overestimate regrowth, conveniently ignoring how climate change hamstrings regrowth and fuels wildfires that release yet more emissions. —John P. O’Brien, Mercury News, 13 Sep. 2025

Electric trucks from Volvo Trucks, supported by material transport, are enabling fully emission-free operations from selective gutting through to concrete crushing, materials processing, and transport. —Prabhat Ranjan Mishra, Interesting Engineering, 13 Sep. 2025

Word History

First Known Use

1607, in the meaning defined at sense 1a

Phrases Containing emission

• acoustic emission
• positron-emission tomography
• re-emission
• secondary emission

Rhymes for emission

• addition
• admission
• ambition
• attrition
• audition
• clinician
• cognition
• coition
• commission
• condition
• contrition
• dentition

Kids Definition

emission

noun

emis·​sion ē-ˈmish-ən 

1

: an act or instance of emitting

2

: something emitted or discharged

emissive

ē-ˈmis-iv 

adjective

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