1. If you simulate an action or a feeling, you pretend that you are doing it or feeling it.
eg. I tried to simulate surprise at the news.
2. simulate something to create particular conditions that exist in real life using computers, models, etc, usually for study or training purposes.
eg. Computer software can be used to simulate conditions on the seabed.
Role-playing is a useful way of simulating real-life situations.
3 simulate something to be made to look like something else
eg. a gas heater that simulates a coal fire.