| Particles | Any objects treated as a unit (e.g. gas molecules) |
| Pests | Species causing damage to crops or forests |
| Plug-and-play modularity | The ability to insert a submodel (module) into a model, and immediately run the new model |
| Population dynamics | Changes in the size of a population |
| Population submodel | A Simile technical term, denoting a submodel which can have instances that are created and destroyed during a simulation |