What is "regular polygon"

Regular \Reg"u*lar\ (-l?r), a. [L. regularis, fr. regula a rule, fr. regere to guide, to rule: cf. F. r['e]gulier. See Rule.]

1. Conformed to a rule; agreeable to an established rule, law, principle, or type, or to established customary forms; normal; symmetrical; as, a regular verse in poetry; a regular piece of music; a regular verb; regular practice of law or medicine; a regular building.

2. Governed by rule or rules; steady or uniform in course, practice, or occurence; not subject to unexplained or irrational variation; returning at stated intervals; steadily pursued; orderlly; methodical; as, the regular succession of day and night; regular habits.

3. Constituted, selected, or conducted in conformity with established usages, rules, or discipline; duly authorized; permanently organized; as, a regular meeting; a regular physican; a regular nomination; regular troops.

4. Belonging to a monastic order or community; as, regular clergy, in distinction dfrom the secular clergy.

5. Thorough; complete; unmitigated; as, a regular humbug.

6. (Bot. & Zo["o]l.) Having all the parts of the same kind alike in size and shape; as, a regular flower; a regular sea urchin.

7. (Crystallog.) Same as Isometric.

   Regular polygon (Geom.), a plane polygon which is both equilateral and equiangular.

   Regular polyhedron (Geom.), a polyhedron whose faces are equal regular polygons. There are five regular polyhedrons, -- the tetrahedron, the hexahedron, or cube, the octahedron, the dodecahedron, and the icosahedron.

   Regular sales (Stock Exchange), sales of stock deliverable on the day after the transaction.

   Regular troops, troops of a standing or permanent army; -- opposed to militia.

   Syn: Normal; orderly; methodical. See Normal.

n. (context mathematics English) A polygon which is both equiangular and equilateral (i.e. having all sides the same length and all interior angles the same).

n. a polygon with all sides and all angles equal