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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.

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

From The Wall Street Journal • Apr. 9, 2026

There was a crater, he said, on the nearside-farside boundary - a bright spot to the northwest of Glushko crater.

From BBC • Apr. 7, 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

About 100 feet away, a metal post denoted the park’s boundary.

From Los Angeles Times • Mar. 30, 2026

There was no boundary he couldn’t touch, no field off-limits, no end to what was possible.

From "The Season of Styx Malone" by Kekla Magoon