equilateral

• æquilateral (archaic)

From equi- + lateral.

• Rhymes: -ætəɹəl

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equilateral (not comparable)

1. (geometry, of a polygon) Having all the sides equal.
   • 2025 April 12, Edward Luce, “The revenge of geopolitics”, in FT Weekend (Life & Arts section), London: The Financial Times Ltd., →ISSN, →OCLC, page 2:

     Kissinger had wanted to keep an “equilateral” distance between the US, USSR and China. Under Carter, they became de facto partners.

2. (geometry, of a polyhedron) Having all the faces equal.
3. (zoology) Having the two sides equal, as a surface divisible by a longitudinal median line into two halves of the same form.
4. (zoology) Having all the convolutions of the shell in one plane, chiefly of foraminifers.

equilateral (plural equilaterals)

1. A side exactly corresponding, or equal, to others.
2. A figure having all its sides equal.