WordReference Random House Learner's Dictionary of American English © 2019
inˈter•nal-comˈbus•tion ˌen•gine, n. [countable]
  • Automotivean engine in which the process of combustion or the burning of fuel takes place within the engine's cylinders.

  • WordReference Random House Unabridged Dictionary of American English © 2019
    internal-combustion en′gine, 
  • Automotivean engine of one or more working cylinders in which the process of combustion takes place within the cylinders.
    • 1880–85


    Collins Concise English Dictionary © HarperCollins Publishers::

    internal-combustion engine n
    1. a heat engine in which heat is supplied by burning the fuel in the working fluid (usually air)



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