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
boundarylessness
noun
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
Michael Igl similarly resigned from the White Lake School District in northern Wisconsin but kept his license in exchange for taking a course on maintaining appropriate boundaries.
—
Danielle Duclos, jsonline.com, 17 Oct. 2025
These archival treasures unfold the complex lives of the partners, who wrote and rehearsed at home, and lay bare the stresses that all four endured because there was no boundary between performance and reality.
—Helen Shaw, New Yorker, 17 Oct. 2025
Equipped with dual Intel RealSense depth cameras, a 6-axis IMU and a modular software development kit with Python support, the 121-lb robot is built to push the boundaries of embodied AI and motion research.
—Georgina Jedikovska, Interesting Engineering, 17 Oct. 2025
The close and sometimes contentious relationship between an old stadium and its neighbors is something that could only happen in a college town, where the boundary between big-time sports and quiet domesticity is constantly shifting.
—Austin Meek, New York Times, 17 Oct. 2025
See All Example Sentences for boundary
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Danielle Duclos, jsonline.com, 17 Oct. 2025
These archival treasures unfold the complex lives of the partners, who wrote and rehearsed at home, and lay bare the stresses that all four endured because there was no boundary between performance and reality.
—Helen Shaw, New Yorker, 17 Oct. 2025
Equipped with dual Intel RealSense depth cameras, a 6-axis IMU and a modular software development kit with Python support, the 121-lb robot is built to push the boundaries of embodied AI and motion research.
—Georgina Jedikovska, Interesting Engineering, 17 Oct. 2025
The close and sometimes contentious relationship between an old stadium and its neighbors is something that could only happen in a college town, where the boundary between big-time sports and quiet domesticity is constantly shifting.
—Austin Meek, New York Times, 17 Oct. 2025
See All Example Sentences for boundary
Cite this Entry
“Boundary.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/boundary. Accessed 19 Oct. 2025.
Copy CitationKids Definition
boundary
noun
bound·ary
ˈbau̇n-d(ə-)rē
plural boundaries
: something that points out or shows a limit or end : dividing line
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