1
a
: of, relating to, or having the form of a triangle
a triangular plot of land
b
: having a triangular base or principal surface
a triangular table
a triangular pyramid
2
a(1)
: of, relating to, or involving three elements
a triangular agreement
(2)
of a military group : based primarily on three units
b
: of or relating to a love triangle

Examples of triangular in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The triangular pickup had sales of 38,965 units last year, Cox Automotive estimates, well below the 250,000 that Musk initially predicted Tesla would produce by 2025. Chris Kirkham, USA TODAY, 10 Mar. 2025 Read More | Pregnant mountain creature with ‘triangular’ head found in China. Stories By Real-Time News Team, With Ai Summarization, Miami Herald, 7 Mar. 2025 The triangular hat is made from a series of floating mirror panels that resemble the rings around a planet. Samantha Conti, WWD, 22 Feb. 2025 Architect says 358 Greenbelt apartments could yet be built The larger triangular property to the north of the Symposion site also attracted a development proposal in 2021. Nick Rosenberger, Idaho Statesman, 4 Mar. 2025 See All Example Sentences for triangular

Word History

Etymology

Middle English trianguler, from Late Latin triangularis, from Latin triangulum

First Known Use

14th century, in the meaning defined at sense 1a

Time Traveler
The first known use of triangular was in the 14th century

Cite this Entry

“Triangular.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/triangular. Accessed 25 Mar. 2025.

Kids Definition

triangular

adjective
1
: of, relating to, or having the form of a triangle
2
: having a triangular base or principal surface
a triangular pyramid

Medical Definition

More from Merriam-Webster on triangular

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