: 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
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.
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And on the top right are the inhibitory emotions — emotions like anxiety, shame and guilt; their job is to push down our core emotions, which are at the bottom of the triangle.—CNN Money, 25 Sep. 2025 As the deceased mother of Conrad and Jeremiah and pseudo-auntie to Belly Conklin, Susannah haunts season three’s love triangle heavily, to the point that after Belly and Conrad hook up in the finale, Belly’s first postcoital thoughts aren’t about the love of her life but his mom.—Bethy Squires, Vulture, 25 Sep. 2025 So dark but for a splash of moon in the triangle window that made everything a little silvery.—Literary Hub, 24 Sep. 2025 As with Passion, power plays a central role in this tale of a royal bisexual love triangle.—Mathew Rodriguez, Them., 23 Sep. 2025 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
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