Meaning of “combustion” in the English Dictionary

"combustion" in British English

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combustionnoun [ U ]

uk /kəmˈbʌs.tʃən/ us /kəmˈbʌs.tʃən/

the process of burning

specialized chemistry the chemical process in which substances mix with oxygen in the air to produce heat and light

(Definition of “combustion” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"combustion" in American English

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combustionnoun [ U ]

us /kəmˈbʌs·tʃən/

the process of burning:

Fuel combustion produces energy to run machines.
combustible
adjective us /kəmˈbʌs·tə·bəl/

Gasoline is a highly combustible substance.

(Definition of “combustion” from the Cambridge Academic Content Dictionary © Cambridge University Press)