periphery

noun

pe·​riph·​ery pə-ˈri-f(ə-)rē 

plural peripheries

1

: the perimeter of a circle or other closed curve

also : the perimeter of a polygon

2

: the external boundary or surface of a body

3

a

: the outward bounds of something as distinguished from its internal regions or center : confines

b

: an area lying beyond the strict limits of a thing

Synonyms of periphery

• perimeter
• edge
• confines
• circumference
• boundary
• border
• edging

Examples of periphery in a Sentence

the dogs are confined by an invisible electronic fence that runs along the periphery of the yard

Recent Examples on the Web

China remains deeply cautious about using its military beyond its immediate periphery, and Russia’s footprint in the Middle East has only shrunk since the fall of Syrian President Bashar al-Assad. — Michael Fuchs, Foreign Affairs, 6 Aug. 2026

This channel, this protein, seems to be very specific to pain neurons in the periphery. — Quanta Magazine, 6 Aug. 2026

These teams have moved customer feedback from the periphery of their planning process to its center. — Christian Wiklund, Forbes.com, 6 Aug. 2026

Iosseliani’s poetic portraits of life on the Soviet periphery range from neorealist documentation of collective farms to playful snapshots of Tbilisi, with a light touch reminiscent of the French New Wave. — Rhoda Feng, New Yorker, 31 July 2026

Word History

Etymology

Middle French peripherie, from Late Latin peripheria, from Greek periphereia, from peripherein to carry around, from peri- + pherein to carry — more at bear

First Known Use

circa 1568, in the meaning defined at sense 1

Kids Definition

periphery

noun

pe·​riph·​ery pə-ˈrif-(ə-)rē 

plural peripheries

1

: the boundary or surface of a body or figure

2

: the outer or outermost part

Medical Definition

periphery

noun

pe·​riph·​ery pə-ˈrif-(ə-)rē 

plural peripheries

1

: the outward bounds of something as distinguished from its internal regions or center

2

: the regions (as the sense organs, the muscles, or the viscera) in which nerves terminate