Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “triangle”

triangle

noun [C]     /ˈtraɪæŋɡl/
SHAPE B2 a flat shape with three sidesGeometrical shapesSpherical, circular and annular objects
MUSICAL INSTRUMENT a small musical instrument made of a piece of metal with three sides which you hit with a metal barPercussion instruments
triangular     /traɪˈæŋɡjələr/ adjective shaped like a triangleGeometrical shapesSpherical, circular and annular objects
(Definition of triangle noun from the Cambridge Learner's Dictionary © Cambridge University Press)

Definitions of “triangle” in other dictionaries

Word of the Day

closeness

the quality of knowing someone very well, liking them a lot, and wanting to spend a lot of time together

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More