noun
triangle
TREYE-uhng-guhl
noun
1
A flat shape with three straight sides and three angles.
"She folded the paper into a triangle."
2
A percussion instrument made of a metal rod bent into a triangle, played by striking it with a small metal beater.
"The young student played the triangle in the school orchestra."
3
A romantic situation involving three people, especially two people competing for one.
"The plot revolves around a classic love triangle."
How to Use Triangle
Learner’s notesIn plain EnglishA three-sided shape — or, figuratively, a situation involving three people or elements, like a love triangle.
Common pairings
equilateral triangle
love triangle
right triangle
Word Forms
triangles plural
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Etymology
From Latin triangulum, "three-cornered," from tres ("three") plus angulus ("corner, angle").