Generally, a periphery is a boundary or outer part of any space or body. It is derived from the Greek word περιφέρεια, meaning a circumference or outer surface.
- In biology, the periphery of the body is the part that is away from the central or core regions.
- Peripheral vision is that part of visual perception that occurs in the periphery, i.e., near the edges, of the field of view.
- A computer peripheral is added to a host computer in order to expand its abilities.
- For peripheral submanifolds in mathematics, see boundary parallel.
- Periphery countries includes nations that are not core countries - capitalist or industrialized nations. See Immanuel Wallerstein, Third World.
- The 13 peripheries of Greece are subnational subdivisions of that country, equivalent to regions.
- In Issac Asimov's Foundation Series, the Periphery is that part of the Empire that lies on the very edge of the Milky Way Galaxy. The Foundation, located on the planet Terminus lies in the Periphery, in the ancient imperial provence of Anacreon.
- Periphery also refers to the boundary of a town or city, also known as outskirts or suburbs ; it also refers to what is not mainstream or central.