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Definition of equilateral

equilateral

/ˌiːkwɪˈlætərəl/
e · qui · lat · er · al
Adverb:equilaterally
•
Plural:equilaterals
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equilateral Lexical Profile

equilateral Game Scores & Validity

• adjective

1

Having all sides of equal length, especially with reference to a polygon such as a triangle.

Example

"Every angle in an equilateral triangle measures exactly sixty degrees."

Synonyms
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Antonyms
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• noun

1

A geometric figure, especially a triangle, whose sides are all of equal length.

Example

"The geometry students used a compass and straightedge to construct a precise equilateral on their graph paper."

• Rhymes for equilateral

• Nearby Words

equiconvex
equidistant
equidistantly
equilateral
equilibrium
equine
equinox

Word Origin & Etymology

Borrowed in the late 16th century from Late Latin aequilateralis, formed from Latin aequilaterus ('equal-sided'), combining aequus ('equal') and latus, lateris ('side').

Cite this Entry

Wordmom. (2026). Definition of Equilateral. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/equilateral
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