| Ecophysiology | Physiological processes in ecosystem components, typically plant-growth modelling in terms of photosynthesis and respiration |
| Evapotranspiration | Evaporation of surface water plus water transpired (evaporated through stomata) by plants |
| Exclusive Role | If exactly one instance of an association model exists for each instance of a base model, then it has an exclusive role. If the role is marked as exclusive, the base model can get single values rather than lists from the association. |
| Exponential growth | Growth where each unit contributes a fixed amount per unit of time; unrestricted growth |