Webster's English Dictionary

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combustion

com.bus.tion \k*m-'b*s-ch*n\ \-'b*s-tiv\ n 1: an act or instance of burning 
    2a: a chemical process (as an oxidation) accompanied by the evolution of 
   li ght and heat 2b: a slower oxidation  3: violent agitation : TUMULT  - 
   com.bus.tive aj