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.

I press her to say who she means, but it’s the one time she sets a boundary.

From Los Angeles Times • Apr. 15, 2026

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

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

This area is separated from the rest of the cell by an actin-myosin condensate barrier, which acts like a physical boundary and directs proteins to the advancing edge.

From Science Daily • Apr. 1, 2026

Old men who didn’t know whether they were going to stagger over the boundary of the century looked forward to it with distaste.

From "East of Eden" by John Steinbeck

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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