involving or exhibiting symmetry; proportional in parts; having its parts in due proportion as to dimensions; as, a symmetrical body or building.-having the organs or parts of one side corresponding with those of the other; having the parts in two or more series of organs the same in number; exhibiting a symmetry.  see symmetry, 2.-having an equal number of parts in the successive circles of floral organs; -- said of flowers.-having a likeness in the form and size of floral organs of the same kind; regular.-having a common measure; commensurable.-having corresponding parts or relations.