Learn how to say Combustion correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word combustion:
the process of burning
any process in which a substance reacts with oxygen to produce a significant rise in temperature and the emission of light
a chemical process in which two compounds, such as sodium and chlorine, react together to produce heat and light
a process in which a compound reacts slowly with oxygen to produce little heat and no light
comˈbustive noun, adjective
C15: from Old French, from Latin combūrere to burn up, from com- (intensive) + ūrere to burn