- noun a state where two sides of something are exactly the same
- noun an exact matching in position or form of points on an object that are equally positioned about a given point, line or plane bisecting the object
- A balance, correspondence, proportion, or relationship, such as that observed in forms, magnitudes, or values existing or occurring on opposite sides of a line, axis, or plane. For example, a symmetric wave, symmetrical conductivity, or the arrangement of a push-push circuit.
- noun the regularity of structure and distribution of parts of the body, each side of the body being structurally similar to the other