The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

   Syn: Counterfeiting; feint; pretense.
        [1913 Webster]

WordNet (r) 3.0 (2006):

simulation
    n 1: 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)
    2: (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: simulation, computer simulation]
    3: representation of something (sometimes on a smaller scale)
       [syn: model, simulation]
    4: the act of giving a false appearance; "his conformity was
       only pretending" [syn: pretense, pretence, pretending,
       simulation, feigning]

Moby Thesaurus II by Grady Ward, 1.0:

110 Moby Thesaurus words for "simulation":
   accordance, acting, adoption, affectation, agreement, alikeness,
   alliance, analogy, aping, appearance, approach, appropriation,
   approximation, assimilation, assumption, attitudinizing, bluff,
   bluffing, borrowed plumes, cheating, closeness, color, coloring,
   community, comparability, comparison, conformity, copying,
   correspondence, counterfeiting, deception, delusion, derivation,
   deriving, disguise, dissemblance, dissembling, dissimulation,
   emulation, facade, face, fakery, faking, false air, false front,
   false show, falsity, feigning, feint, following, forgery,
   four-flushing, fraud, front, gilt, gloss, hit-off, humbug,
   humbuggery, identity, imitation, impersonation, imposture,
   impression, infringement, likeness, likening, masquerade,
   meretriciousness, metaphor, mimesis, mimicking, mirroring, mocking,
   nearness, onomatopoeia, ostentation, outward show, parallelism,
   parity, parody, pasticcio, pastiche, pirating, plagiarism,
   plagiary, playacting, pose, posing, posture, pretense, pretension,
   pretext, repetition, representation, resemblance, sameness,
   seeming, semblance, sham, show, similarity, simile, similitude,
   simulacrum, speciousness, takeoff, taking, varnish,
   window dressing



The Free On-line Dictionary of Computing (30 December 2018):

simulation
simulate

    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.

   (1995-02-23)


Bouvier's Law Dictionary, Revised 6th Ed (1856):

SIMULATION, French law. This word is derived from the Latin simul, together.
It indicates, agreeably to its etymology, the concert or agreement of two or
more persons to give to one thing the appearance of another, for the purpose
of fraud. Merl. Repert. h.t.
     2. With us such act might be punished by indictment for a conspiracy;
by avoiding the pretended contract; or by action to recover back the money
or property which may have been thus fraudulently obtained.