emission
ee-MISH-uhn
/ɪˈmɪʃən/
The production and discharge of something, especially gas or radiation.
In environmental contexts, it almost always refers to pollutants released into the atmosphere.
The story behind the word. From the Latin 'emissio', which literally means 'a sending out'. Originally used for sending out messengers, it shifted to physical discharges in the 17th century.
Word relationships
- discharge: Discharge is often used for liquids into water; emission is usually for gases into air.
- absorption: Taking in a substance rather than releasing it.
Commonly confused with
- omission: Omission means leaving something out; emission means sending something out.
Word family
- emit (verb): To produce or discharge.
- emitter (noun): A source that discharges something.
Collocations
- carbon emissions
- zero emissions
- exhaust emissions
Example sentences
- "The government has pledged to reduce carbon emission levels by fifty percent by 2030." Climate policy discussion.
- "Newer car models are designed to have lower nitrogen oxide emission than their predecessors." Automotive engineering.
Memory hook
E-mission: The 'E' stands for 'Exit'. It is the 'mission' of the gas to 'exit' the pipe. Sending stuff out.
When not to use
Avoid using it for things that are leaked accidentally; 'leak' or 'spill' is better for accidents.
Fun facts
- The term 'zero-emission vehicle' (ZEV) is a legal standard in several countries.
Related words
Explore more words
pollutant, effluent, output, mitigation, footprint, production
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