| Term | Definition |
|---|---|
| density | the frequency with which something exists within a given unit of area |
| diffusion | the process of spread of a feature or trend from one place to another over time |
| distance decay | the diminishing in importance and eventual disappearance of a phenomena with increasing distance from its origin |
| distribution | the arrangement of something across Earth's surface |
| environmental determinism | geography as the study of how physical environment has caused human activities |
| expansion diffusion | the spread of a feature or trend among people from one area to another in a snowballing process |
| formal region | also known as uniform/homogeneous; an area in which everyone shares one or more distinctive characteristics |
| functional region | also known as nodal; an area organized around a node or focal point |