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

Arrange a conversation set in a circle or an L-shape so no one is left on the periphery. —Kansas City Star, 1 May 2026

It is surrounded by appliqué ornamentation reflecting the decorative arts of each culture and an ornate frieze around the periphery. —Rachel Cormack, Robb Report, 30 Apr. 2026

What once seemed like a story from the periphery can now be understood as a warning from the edge of a condition that is spreading. —Harrison Jacobs, ARTnews.com, 29 Apr. 2026

Data from the German Aerospace Center, which analyzes global development, cross-referenced with images from ICEYE and Vantor show that buildings making up the peripheries of the cities damaged by this year’s fires mostly sprang up in the 2000s and 2010s. —Stefano Pozzebon, CNN Money, 26 Apr. 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