Generally, a periphery is a boundary or outer part of any space or body.
In biology
In national divisions
In fiction
- Periphery (BattleTech), the region of interstellar space in the fictional universe of BattleTech
- The Periphery, that part of the Empire that lies on the very edge of the Milky Way Galaxy in Issac Asimov's Foundation series
In other uses
- Peripheral, a device added to a host computer in order to expand its abilities
- Boundary parallel, a property of a mathematical submanifolds