Equilateral meaning

ēkwə-lătər-əl, ĕkwə-
A side exactly equal to others.
noun
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Having all sides of equal length, as a triangle that is neither scalene nor isosceles.
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Having all sides or faces equal.
adjective
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A geometric figure having all sides equal.
noun
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Having all sides equal.

An equilateral triangle.

adjective
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A figure having equal sides.
noun
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A side exactly equal to another or others.
noun
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(geometry) Referring to a polygon all of whose sides are of equal length. Not necessarily a regular polygon since the angles can still differ (a regular polygon would also be equiangular).
adjective
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An equilateral triangle.
noun
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