Having all sides of equal length, typically used to describe triangles and other polygons.
From Latin 'aequilateralis' (equal-sided), combining 'aequi-' (equal) and 'latus' (side). The term became standardized in geometry and mathematics starting in the medieval period.
An equilateral triangle is the most symmetric triangle possible, and it shows up everywhere in nature—from honeycomb structures bees build to the geometry of molecular bonds, because equal angles and sides are energy-efficient.
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