›[C]a situation or event that seems real but is not real, used especially in order to help people deal with such situations or events: in a simulationIf we can make mistakes in a simulation that keep you from making mistakes in the real world, that definitely saves lives.a simulation of sthThey are carrying out a detailed simulation of how their plan would work.a computer simulation
›[U]the use of situations or events that seem real but are not real, especially in order to help people deal with such situations or events: through simulationThe evaluation of the various design options was done through simulation.