combustion

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com|bus|tion /kəmb'ʌstʃən/
[N-UNCOUNT] oft N n
Combustion is the act of burning something or the process of burning. (TECHNICAL)
The energy is released by combustion on the application of a match...
see also internal combustion enginein|ter|nal com|bus|tion en|gine (internal combustion engines)
[N-COUNT]
An internal combustion engine is an engine that creates its energy by burning fuel inside itself. Most cars have internal combustion engines.

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