Thesaurus.com
Dictionary.com
Definitions

boundary

[boun-duh-ree, -dree] / ˈbaʊn də ri, -dri /
NOUN
outer limit
Synonyms
STRONGEST
barrier border borderline bounds confines edge frontier horizon line perimeter
STRONG
ambit beginning borderland brink circumference circumscription compass end environs extent extremity frame fringe hem limits march margin mark mere mete outline outpost pale periphery precinct purlieus radius rim side skirt terminal termination terminus verge
WEAK
abuttals line of demarcation
Antonyms
STRONGEST
center inside interior middle
STRONG
opening start
WEAK
minimum

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Drag was an important part of Ortiz’s approach to playing Jim Jimenez, the boundary breaking nonbinary pirate heartthrob on HBO’s cult show “Our Flag Means Death.”

From Los Angeles Times • Apr. 1, 2026

Unless the stock can get firmly above the upper boundary of the resistance zone, which comes in around $298, the key downside level to watch is the March 12 intraday low of around $279.

From MarketWatch • Mar. 31, 2026

Uniformed guards stood at regular points along the boundary.

From Barron's • Mar. 29, 2026

All five councils affected by the park's proposed boundary said they had reservations, with several issuing a formal objection.

From BBC • Mar. 26, 2026

At the back edge of the barn he hesitated, staring into the seemingly endless gulf between the barn and the trees at the boundary between his backyard and the Sports Family's.

From "Among the Hidden" by Margaret Peterson Haddix

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.