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boundary

noun
bound·​ary | \ ˈbau̇n-d(É™-)rÄ“ How to pronounce boundary (audio) \
plural boundaries

Definition of boundary

: 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
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Other Words from boundary

boundaryless \ ˈbau̇n-​d(É™-​)rÄ“-​lÉ™s How to pronounce boundaryless (audio) \ adjective
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?
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Recent Examples on the Web

 Ever since, the North American plate has met face to face with the Pacific plate, the two grinding past each other at a boundary called a strike-slip fault. — Maya Wei-haas, National Geographic, "Hidden earthquake risk found lurking beneath Los Angeles," 30 Aug. 2019 That’s where the boundary is, and that’s where my life has become manageable. — Glamour, "Taylor Swift Gets Candid About Politics, Privilege, and How Pop Can Feel Like the Hunger Games," 25 Aug. 2019 There is a boundary where the field lines aren’t closed anymore. — Chris Lee, Ars Technica, "Sun’s solar wind recreated in lab with aid of Big Red Ball," 23 Aug. 2019 Heat and humidity are high enough to allow the clouds to form and the tropopause—the boundary between the troposphere and stratosphere—is about 10 miles up, giving large storms plenty of room to form. — Jason Daley, Smithsonian, "Rare Lightning Strikes Detected 300 Miles From North Pole," 14 Aug. 2019 Cherry Lake is located outside a wilderness boundary for Yosemite National Park, in the central Sierra north of Groveland. — Tom Stienstra, SFChronicle.com, "Cherry Lake a testament to NorCal lakes," 8 Aug. 2019 Forecasters said a nearly stationary frontal boundary draped over the area is expected to dissipate over the next few days. — Leigh Morgan, al, "Tropical development in Gulf looks unlikely, forecasters say," 25 July 2019 Chemerinsky wrote, arguing that it can be read as a protection for individual liberties as well as a structural boundary for the republic. — Matt Ford, The New Republic, "Make the Guarantee Clause Great Again," 17 July 2019 With a boundary agreed upon, the next step was the immense job of surveying and marking it. — Anchorage Daily News, "The thin line between Alaska and Canada," 13 July 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'boundary.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of boundary

1598, in the meaning defined above

History and Etymology for boundary

bound entry 2 + -ary entry 1

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More Definitions for boundary

boundary

noun
How to pronounce boundary (audio)

English Language Learners Definition of boundary

: something (such as a river, a fence, or an imaginary line) that shows where an area ends and another area begins
: a point or limit that indicates where two things become different
: unofficial rules about what should not be done : limits that define acceptable behavior

See the full definition for boundary in the English Language Learners Dictionary

boundary

noun
bound·​ary | \ ˈbau̇n-dÉ™-rÄ“ How to pronounce boundary (audio) , ˈbau̇n-drÄ“\
plural boundaries

Kids Definition of boundary

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

boundary

noun
bound·​ary
plural boundaries

Legal Definition of boundary

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

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More from Merriam-Webster on boundary

Rhyming Dictionary: Words that rhyme with boundary

Thesaurus: All synonyms and antonyms for boundary

Spanish Central: Translation of boundary

Nglish: Translation of boundary for Spanish Speakers

Britannica English: Translation of boundary for Arabic Speakers

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