possessing or displaying symmetry Compare asymmetric

2.

(maths)

(of two points) capable of being joined by a line that is bisected by a given point or bisected perpendicularly by a given line or plane the points (x, y) and (–x, –y) are symmetrical about the origin

(of a configuration) having pairs of points that are symmetrical about a given point, line, or plane a circle is symmetrical about a diameter

(of an equation or function of two or more variables) remaining unchanged in form after an interchange of two variables x + y = z is a symmetrical equation

3.

(chem) (of a compound) having a molecular structure in which substituents are symmetrical about the molecule