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Definition of computation. 1  1a : the act or action of computing : calculationb : the use or operation of a computer. 2  2 : a system of reckoning. 3  3 : an amount computed.
what is simulation? Computer simulation is the discipline of designing a model of an actual or theoretical physical system, executing the model on a digital computer, and analyzing the execution output. Simulation embodies the principle of ``learning by doing'' --- to learn about the system we must first build a model of some sort and then operate the model.