Something that is symmetrical has corresponding similar parts: in other words, one side is the same as the other.

If you can draw a line down the center of something and get two similar halves, it’s symmetrical. Shapes like squares and circles are symmetrical. Unless you've had a serious injury like losing a limb, the human body is symmetrical. Some people think that faces that are more perfectly symmetrical are more beautiful than other faces. On the other hand, an eye patch tends to look kind of cool, even though it makes a face unsymmetrical.

Definitions of symmetrical

adj exhibiting equivalence or correspondence among constituents of an entity or between different entities

harmonious, proportionate
being in a state of proper equilibrium

adj having similarity in size, shape, and relative position of corresponding parts

being everywhere equidistant and not intersecting
in accordance with fixed order or procedure or principle
bilateral, bilaterally symmetric, bilaterally symmetrical, isobilateral
having identical parts on each side of an axis
showing both bilateral and radial symmetry
cruciate, cruciform
shaped like a cross
even, regular
symmetrically arranged
(of a triangle) having two sides of equal length
radial, radiate, stellate
arranged like rays or radii; radiating from a common center
centrosymmetric, radially symmetrical
having a symmetrical arrangement of radiating parts about a central point
rhombohedral, trigonal
having threefold symmetry
asymmetric, asymmetrical
characterized by asymmetry in the spatial arrangement or placement of parts or components
contrary to rule or accepted order or general practice
having one side lower or smaller or lighter than the other
such that the terms of an expression cannot be interchanged without changing the meaning
unsymmetric, unsymmetrical
lacking symmetry
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