Meaning of “equilateral” in the English Dictionary

british dictionary

"equilateral" in British English

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equilateraladjective

uk /ˌiː.kwɪˈlæt.ər.əl/ /ˌek.wɪˈlæt.ər.əl/ us /ˌiː.kwəˈlæt̬.ɚ.əl/

used to describe a shape whose sides are all the same length:

an equilateral triangle

(Definition of “equilateral” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)