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The meaning of SYMMETRY is balanced proportions; also : beauty of form arising from balanced proportions. How to use symmetry in a sentence. Symmetry , In geometry, the property by which the sides of a figure or object reflect each other across a line (axis of symmetry ) or surface; in biology, the orderly repetition of parts of an animal or plant; in chemistry, a fundamental property of orderly arrangements of atoms in molecules or In mathematics, symmetry is the property that divides a geometrical shape into two identical halves. Heart shape, an equilateral triangle, and a rhombus are all examples of symmetry . Such shapes are called symmetric. Symmetry is a property of an object that allows us to divide it into two identical halves, which are mirror images of each other. Learn about lines of symmetry & more.