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
That is not to say that boundaries aren't equally important.
—
Madeline Mitchell, USA Today, 20 June 2026
Both fractures make up the boundary of the Pacific and North American tectonic plates, which have been sliding past each other a few centimeters each year while other zones are locked.
—Kasha Patel, CNN Money, 19 June 2026
Canetti saw the impulse to join a crowd as part of a deeply human desire to dissolve individual boundaries, to both lose yourself and experience a kind of emotional release, a sense of power, that comes with feeling many times larger than just your isolated self.
—Boris Kachka, The Atlantic, 19 June 2026
Staying Connected To Work Around The Clock Many professionals no longer have a clear boundary between work and home.
—Maia Niguel Hoskin, Forbes.com, 19 June 2026
See All Example Sentences for boundary
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Madeline Mitchell, USA Today, 20 June 2026
Both fractures make up the boundary of the Pacific and North American tectonic plates, which have been sliding past each other a few centimeters each year while other zones are locked.
—Kasha Patel, CNN Money, 19 June 2026
Canetti saw the impulse to join a crowd as part of a deeply human desire to dissolve individual boundaries, to both lose yourself and experience a kind of emotional release, a sense of power, that comes with feeling many times larger than just your isolated self.
—Boris Kachka, The Atlantic, 19 June 2026
Staying Connected To Work Around The Clock Many professionals no longer have a clear boundary between work and home.
—Maia Niguel Hoskin, Forbes.com, 19 June 2026
See All Example Sentences for boundary
Cite this Entry
“Boundary.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/boundary. Accessed 21 Jun. 2026.
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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