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.

Maritime experts have said there is no legal argument for why Iran would be able to regulate commercial shipping on Oman’s side of the maritime boundary.

From The Wall Street Journal • Apr. 8, 2026

They found that interactions between the magnetosphere and the solar wind at its outer boundary closely resemble processes observed at Jupiter.

From Science Daily • Apr. 3, 2026

Smith starred again in the second wicket when Jamie Smith, having just driven Bamber to the cover boundary, attempted to repeat the shot and was caught by the keeper, diving in front of slip.

From BBC • Apr. 3, 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

“She crosses every social boundary in the building, and that is very rare,” he says.

From "Drama High" by Michael Sokolove

Vocabulary lists containing boundary

Human Geography - Middle School

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Human Geography - High School

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Political Geography - Middle School

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