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.

Living near the Boundary Waters satisfied Sims’s penchant for the outdoors, and he loved taking his kids on camping and canoeing trips, Cathie Sims recalled.

From The Wall Street Journal • Mar. 17, 2026

Boundary information is supplied to the network, which then predicts the full molecular alignment field, including the shapes and positions of defects.

From Science Daily • Jan. 29, 2026

Some of this can be attributed to geological faults including the Great Glen and the Highland Boundary Fault.

From BBC • Dec. 28, 2025

The current cycle ends in October, but Mexico so far has delivered less than 30% of what it owes, according to the International Boundary and Water Commission.

From Los Angeles Times • Apr. 11, 2025

The landscape ahead began to look familiar—Crescent Beach, Boundary Bay.

From "The Son of Neptune" by Rick Riordan

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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