Source : Webster's Revised Unabridged Dictionary (1913)

Simulation \Sim`u*la"tion\, n. [F. simulation, L. simulatio.]
   The act of simulating, or assuming an appearance which is
   feigned, or not true; -- distinguished from dissimulation,
   which disguises or conceals what is true.

   Syn: Counterfeiting; feint; pretense.

Source : WordNet®

simulation
     n 1: (computer science) the technique of representing the real
          world by a computer program; "a simulation should
          imitate the internal processes and not merely the
          results of the thing being simulated" [syn: {computer
          simulation}]
     2: the act of imitating the behavior of some situation or some
        process by means of something suitably analogous
        (especially for the purpose of study or personnel
        training)
     3: representation of something (sometimes on a smaller scale)
        [syn: {model}]
     4: the act of giving a false appearance; "his conformity was
        only pretending" [syn: {pretense}, {pretence}, {pretending},
         {feigning}]

Source : Free On-Line Dictionary of Computing

simulation
     
        Attempting to predict aspects of the behaviour of some system
        by creating an approximate (mathematical) model of it.  This
        can be done by physical modelling, by writing a
        special-purpose computer program or using a more general
        simulation package, probably still aimed at a particular kind
        of simulation (e.g. structural engineering, fluid flow).
        Typical examples are aircraft flight simlators or electronic
        circuit simulators.  A great many simulation languages exist,
        e.g. {Simula}.
     
        See also {emulation}, {Markov chain}.
     
        {Usenet} newsgroup: {news:comp.simulation}.
     
        (1995-02-23)