Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “triangle”

See all translations

triangle

noun [C] uk   /ˈtraɪ.æŋ.ɡl̩/ us  
B2 a flat shape with three straight sides: an equilateral/isosceles triangle anything that has three straight sides: Which earrings did you buy in the end - the triangles or the circles? a musical instrument consisting of a thin metal bar bent into a triangle shape that is hit with a metal bar to make a sound US ( UK set square) a flat piece of metal or plastic in the shape of a triangle with one angle of 90°, used for drawing angles ( also frame) a three-sided frame for arranging the balls at the start of a game of billiards , pool, etc.
More examples
(Definition of triangle from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of triangle?
Add Cambridge dictionaries to your browser to your website

Definitions of “triangle” in other dictionaries

Word of the Day

baby

a very young child, especially one that has not yet begun to walk or talk

Word of the Day

The way we move (Verbs for walking and running)

by Kate Woodford,
March 25, 2015
​​​ This week we’re looking at interesting ways to describe the way that people move. Most of the verbs that we’ll be considering describe how fast or slow people move. Others describe the attitude or state of mind of the person walking or running. Some describe both. Starting with verbs for walking slowly,

Read More 

stackin’ p

March 30, 2015
idiom slang earning a lot of money ‘That’s a very generous present.”Yeah, well, she’s stackin’ p, innit?’

Read More