equilateral

Meanings

1. 1
   adj

   having all sides of equal length

   An equilateral triangle has three equal sides and three equal angles.

2. 2
   noun

   a geometric figure whose sides are all equal in length

   Each equilateral in the diagram has sides measuring ten centimeters.

Formed from equi- ("equal"), from Latin aequus, + lateral, from Latin lateralis ("of the side"), ultimately from latus, lateris ("side"). It therefore means literally "equal-sided."

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