characterized by or exhibiting symmetry; well-proportioned, as a body or whole; regular in form or arrangement of corresponding parts.

Geometry .

noting two points in a plane such that the line segment joining the points is bisected by an axis

Points 1, 1 and 1, ?1 are symmetrical with respect to the x-axis.

noting a set consisting of pairs of points having this relation with respect to the same axis.

noting two points in a plane such that the line segment joining the points is bisected by a point or center

The points 1, 1 and ?1, ?1 are symmetrical with respect to

noting a set consisting of pairs of points having this relation with respect to the same center.

Often, symmetric. Mathematics .

noting a square matrix that is equal to its transpose.

noting a dyad or dyadic that is equal to its conjugate.

noting a relation in which one element in relation to a second implies the second in relation to the first.

Botany .

divisible into two similar parts by more than one plane passing through the center; actinomorphic.

(of a flower) having the same number of parts in each whorl.

Chemistry .

having a structure that exhibits a regular repeated pattern of the component parts.

noting a benzene derivative in which three substitutions have occurred at alternate carbon atoms.

affecting corresponding parts simultaneously, as certain diseases.

adjective

asymmetrical , different , disproportioned , irregular , uneven , unsymmetrical

adjective

balanced , commensurable , commensurate , equal , in proportion , proportional , regular , shapely , well-formed , proportionate , symmetric , congruous , harmonious