simulate

To simulate something is to create or show something that seems real, even when it is not. Think of a flight simulator: pilots can practice in a setting that feels very close to real flying without ever leaving the ground. A person can also simulate interest in a boring conversation just to be polite. The idea is to produce a believable copy, effect, or feeling without the real thing actually happening.

To simulate means to create, copy, or act out something in a way that closely matches the real thing. It is often used when the real event, system, or feeling is too costly, risky, difficult, or impossible to use directly. A simulation tries to recreate important conditions so people can study them, practice with them, or experience them safely.

Scientists use computer simulations to study complex systems such as weather patterns or climate change. Game developers simulate living, changing worlds for players to explore. Doctors use simulators to practice surgery without putting patients at risk. In all of these cases, the goal is not just to copy the surface of something, but to recreate how it works well enough to learn from it or test it.

But the word is not limited to science or technology. Someone might simulate sympathy without really feeling it, or simulate being busy to avoid work. In that sense, the word means to pretend, to put on an appearance, or to make others believe something is real when it is not.

The key idea is that a simulated thing stands in for reality rather than being reality itself. It may be close enough to teach, test, entertain, or deceive, depending on the situation. So whether someone is building a virtual world, practicing a skill, or merely putting on an act, to simulate is to produce a convincing version of something real.