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⇱ TRIANGLE Definition & Meaning - Merriam-Webster

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1
: a polygon having three sides compare spherical triangle
2
a
: a percussion instrument consisting of a rod of steel bent into the form of a triangle open at one angle and sounded by striking with a small metal rod
b
: a drafting instrument consisting of a thin flat right-angled triangle of wood or plastic with acute angles of 45 degrees or of 30 degrees and 60 degrees
3
: a situation in which one member of a couple is involved in a love affair with a third person
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Illustration of triangle

  • 1 equilateral
  • 2 acute
  • 3 obtuse
  • 4 scalene
  • 5 isosceles
  • 6 right triangle

Examples of triangle in a Sentence

She cut the sandwiches into triangles.
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.
Based on real‑time force sensor data, the robotic arm autonomously guided a docking plug to draw circles, triangles, and straight lines on a drawing board. —👁 Image
Neetika Walter, Interesting Engineering, 1 Apr. 2026 As the championship looms, Isla must manage chaos in the locker room and the boardroom while navigating a complicated love triangle. —👁 Image
Abid Rahman, HollywoodReporter, 1 Apr. 2026 On the romantic front, Dónal Finn and Laurie Davidson form Mary’s unsurprising love triangle. —👁 Image
Hanna Wickes, Kansas City Star, 1 Apr. 2026 Those rural Black voters are concentrated east of the triangle, extending along winding state highways through small towns, flatlands and farmland toward the Atlantic coastline. —👁 Image
Bill Barrow, Los Angeles Times, 1 Apr. 2026 See All Example Sentences for triangle

Word History

Etymology

Middle English, from Anglo-French, from Latin triangulum, from neuter of triangulus triangular, from tri- + angulus angle

First Known Use

14th century, in the meaning defined at sense 1

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

Phrases Containing triangle

Rhymes for triangle

Browse Nearby Words

Cite this Entry

“Triangle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/triangle. Accessed 7 Apr. 2026.

Kids Definition

1
: a figure that has three sides and three angles : a polygon that has three sides
2
: a percussion instrument made of a steel rod bent into a triangle open at one corner which is played by striking with a metal rod
3
: a drafting instrument consisting of a thin flat right-angled triangle

Medical Definition

: a three-sided region or space and especially an anatomical one see anterior triangle, carotid triangle, femoral triangle, posterior triangle, suboccipital triangle

More from Merriam-Webster on triangle

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