triangle Definition in the Cambridge English Dictionary
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Definition of “triangle” - English Dictionary

Definition of "triangle" - American English Dictionary

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trianglenoun [C]

 us   /ˈtrɑɪˌæŋ·ɡəl/
mathematics a ​flatshape with three ​straightsides: Her ​earrings were in the ​shape of triangles. music A triangle is also a ​musicalinstrument consisting of a ​thinmetalbar having three ​sides, which makes a high ​sound when ​held up in the ​air and ​hit with a ​metalbar.
(Definition of triangle from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "triangle" - British English Dictionary

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trianglenoun [C]

uk   us   /ˈtraɪ.æŋ.ɡl̩/
B2 a ​flatshape with three ​straightsides: an ​equilateral/isosceles triangle anything that has three ​straightsides: Which ​earrings did you ​buy in the end - the triangles or the ​circles? a ​musicalinstrument consisting of a ​thinmetalbarbent into a triangle ​shape that is ​hit with a ​metalbar to make a ​sound US (UK set square) a ​flatpiece of ​metal or ​plastic in the ​shape of a triangle with one ​angle of 90°, used for ​drawingangles (also frame) a three-sided frame for ​arranging the ​balls at the ​start of a ​game of billiards , pool, etc.
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(Definition of triangle from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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