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1    the process of burning  
2    any process in which a substance reacts with oxygen to produce a significant rise in temperature and the emission of light  
3    a chemical process in which two compounds, such as sodium and chlorine, react together to produce heat and light  
4    a process in which a compound reacts slowly with oxygen to produce little heat and no light  
     (C15: from Old French, from Latin comburere to burn up, from com- (intensive) + urere to burn)  
  combustive      n, adj  

combustion chamber  
      n   an enclosed space in which combustion takes place, such as the space above the piston in the cylinder head of an internal-combustion engine or the chambers in a gas turbine or rocket engine in which fuel and oxidant burn  
external-combustion engine  
      n   a heat engine in which the working fluid is heated in an external boiler or heat exchanger and is thus isolated from the process of fuel combustion  
heat of combustion  
      n     (Chem)   the heat evolved when one mole of a substance is burnt in oxygen at constant volume  
internal-combustion engine  
      n   a heat engine in which heat is supplied by burning the fuel in the working fluid (usually air)  
spontaneous combustion  
      n   the ignition of a substance or body as a result of internal oxidation processes, without the application of an external source of heat, occurring in finely powdered ores, coal, straw, etc.  
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