combustion

IPA/kəmˈbʌstʃən/
KK[kəmbˈʌstʃən]IPA/kəmˈbʌstʃən/

combustion — noun

1. the process by which something catches fire and burns, producing heat, flames, a

1.nounB2
Definition

the process by which something catches fire and burns, producing heat, flames, and usually smoke

Example

The warehouse reached full combustion within minutes of the first spark.

full combustion — stage of most intense burning

Spontaneous combustion of old hay can cause dangerous barn fires.

spontaneous combustion — fire starting without an obvious ignition source

Common collocations
  • full combustion
  • spontaneous combustion
  • combustion of [something]
  • reach combustion
  • start combustion
Synonyms
  • burning

    the everyday word for the same process; less formal than combustion

  • ignition

    refers specifically to the moment when fire starts, not the ongoing process

Antonyms
  • extinguishing

    the act of putting out a fire and stopping combustion

Usage Note

Combustion is an uncountable noun and cannot be used in the plural. It is more formal and technical than the everyday word 'burning', which is preferred in casual speech.

Common Mistakes

There were several combustions in the old factory last year.
There were several cases of combustion in the old factory last year.
Combustion is uncountable and does not take a plural form.
Combustion can happen without any oxygen present.
Combustion requires oxygen to take place.
Combustion is a chemical reaction that cannot happen without oxygen.

2. a chemical reaction in which a material reacts rapidly with oxygen, producing he

2.nounC1
Definition

a chemical reaction in which a material reacts rapidly with oxygen, producing heat and light, such as in an engine or a fire

Example

In chemistry class, Leila studied how combustion releases energy from different types of fuel.

combustion + releases energy — describes the chemical output of the reaction

During the lab experiment, Yusuf measured the products of methane combustion: carbon dioxide and water vapour.

combustion of [fuel] — standard scientific noun pattern with 'of'

Common collocations
  • complete combustion
  • incomplete combustion
  • rapid combustion
  • combustion of [fuel]
  • combustion reaction
  • combustion temperature
Synonyms
  • burning

    less precise; used in everyday contexts rather than scientific writing

  • oxidation

    a broader category that includes combustion as well as slower reactions like rusting

Usage Note

In scientific writing, combustion is often modified by adjectives such as 'complete', 'incomplete', 'rapid', and 'slow'. The phrase 'combustion of [fuel]' is the standard way to specify what is burning. This sense is distinct from sense 1 in that it emphasizes the chemical mechanism (reaction with oxygen) rather than the visible act of burning.

Common Mistakes

Combustion is the same as explosion.
Combustion can lead to an explosion, but they are not the same thing.
Combustion is the chemical reaction; an explosion is a rapid expansion of gases that may result from combustion.
Complete combustion of petrol produces carbon monoxide.
Complete combustion of petrol produces carbon dioxide and water.
Incomplete combustion produces carbon monoxide; complete combustion produces CO₂ and H₂O.

Word family

  • combust
    verbC1
  • combustible
    adjectiveC1
  • combustibility
    nounC2

Synonym discussion

Sense: noun/2

Combustion and burning both describe the process of something being on fire, but combustion is the more formal scientific term. Burning is the everyday word used for anything that is on fire, from a candle flame to a forest fire, and it focuses on what we can see and feel. Combustion specifically names the chemical reaction with oxygen that produces heat and light, and scientists use it when describing engines, fuels, and energy production. Oxidation is a broader term that includes combustion as well as slower reactions such as rusting or the browning of fruit. Fire refers to the visible flames, heat, and light produced by combustion. For example: 'The fire spread quickly through the dry forest' (everyday observation) versus 'Complete combustion of the fuel mixture requires an adequate supply of oxygen' (scientific description).

combustionburningoxidationfire

Common collocations

Nouns

  • combustion chamber
  • combustion engine
  • combustion process
  • combustion reaction
  • combustion gases
  • combustion products
  • combustion temperature

Phrases

  • cause combustion
  • undergo combustion
  • prevent combustion
  • produce heat through combustion
  • require oxygen for combustion

Adjectives

  • internal
  • spontaneous
  • complete
  • incomplete
  • rapid
  • slow

Prepositions

  • combustion of
  • combustion in

Etymology

LatinFrenchEnglish

Combustion comes from the Latin word 'combustio', meaning 'a burning'. This was formed from 'com-' (meaning 'together') and 'urere' (meaning 'to burn'). The word entered English through French around the 1400s, first used in scientific writings about fire and chemistry.