Etymology
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equilateral (adj.)

"having all sides equal," 1560s, from Late Latin aequilateralis, from aequi- (see equal (adj.)) + lateralis (see lateral). Related: Equilaterally.

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Definitions of equilateral
1
equilateral (n.)
a figure whose sides are all equal;
2
equilateral (adj.)
having all sides or faces equal;
From wordnet.princeton.edu