the act of giving a false appearance
"his conformity was only pretending"
representation of something (sometimes on a smaller scale)
(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"
- computer simulation
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)