boundary

noun

bound·​ary ˈbau̇n-d(ə-)rē 

plural boundaries

: something that indicates or fixes a limit or extent

Those two trees mark the boundary of our property.

the mountain range that forms the country's northern boundary

boundaryless

ˈbau̇n-d(ə-)rē-ləs 

adjective

boundarylessness noun

Synonyms

• bound
• cap
• ceiling
• confines
• end
• extent
• limit
• limitation
• line
• termination

Examples of boundary in a Sentence

Those two trees mark the boundary of our property.

The river forms the country's western boundary.

at the boundary between fact and fiction

You need to set boundaries with your children.

Did he violate the boundaries of the doctor-patient relationship?

Recent Examples on the Web

Right Now Anita Yokota’s House Rules From her two couches in her living room (one for work, one for relaxation) to keeping her daughters’ 45 Squishmallows out of common areas, here’s how Yokota set up her home and set boundaries to create her own personal haven. —Bryce Jones, Better Homes & Gardens, 29 May 2024

Meditation, journaling, finding a safe place to vent concerns, setting boundaries, as well as seeking moments of joy and true connection are mitigators of stress. —Elizabeth Ayoola, Essence, 28 May 2024

The boundaries of the quarantine originally covered 112 square miles of the county. —Caelyn Pender, The Mercury News, 23 May 2024

Gerrymandering is a practice involving the manipulation of the geographical boundaries of electoral districts to marginalize a certain set of voters and increase the influence of others. —Staff, The Christian Science Monitor, 23 May 2024

Word History

Etymology

bound entry 6 + -ary entry 1

First Known Use

1598, in the meaning defined above

Phrases Containing boundary

• boundary layer
• K-T boundary

Kids Definition

boundary

noun

bound·​ary ˈbau̇n-d(ə-)rē 

plural boundaries

: something that points out or shows a limit or end : dividing line

Legal Definition

boundary

noun

bound·​ary

plural boundaries

: a theoretical line that marks the limit of an area of land