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.

This suggests they likely formed farther out and later migrated inward, since forming near the boundary would be extremely difficult.

From Science Daily • Apr. 19, 2026

First, the fact that she felt a vested interest in how much money he gives to his kids crosses a boundary that would make most people uncomfortable.

From MarketWatch • Apr. 13, 2026

Rather than risk crossing a murky boundary, many educators avoided discussing religion altogether.

From The Wall Street Journal • Apr. 9, 2026

It narrates the bittersweet adventures of the titular astronomer and his surveyor sidekick who carved the boundary separating slave states from free.

From Los Angeles Times • Apr. 9, 2026

It wasn’t even one of Clara’s rules; it was just wrong, a boundary that was not supposed to be crossed.

From "Night Owls" by A.R. Vishny

Vocabulary lists containing boundary

Human Geography - Middle School

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Human Geography - High School

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Political Geography - Middle School

Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!