Definition of "equilateral" in English

adjective

1. (geometry, of a polygon) Having all the sides equal.

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.

noun

1. A side exactly corresponding, or equal, to others.

2. A figure having all its sides equal.