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.

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.

• Something which simulates a system or environment in order to predict actual behavior.
        This exercise is a simulation of actual battle conditions.
        The most reliable simulation predicts that the hurricane will turn north.
  
• The process of simulating.
        Despite extensive simulation in the design phase, the aircraft failed to behave as expected.