denotes anything that is agreeable to the rules of art: thus, we say a regular building, verb, &c.

A regular figure, in geometry, is one whose sides, and consequently angles, are equal; and a regular figure with three or four sides, is commonly termed an equilateral triangle, or square; as all others with more sides are called regular polygons.

in a monastery, a person who has taken the vows; because he is bound to observe the rules of the order he has embraced.