symmetry

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symmetry bilateral symmetry radial symmetry

Main Entry: sym·me·try
Pronunciation: sim--tr
Function: noun
Inflected Form(s): plural -tries
1 : correspondence in size, shape, and relative position of parts on opposite sides of a dividing line or median plane or about a center or axis -- see BILATERAL SYMMETRY, RADIAL SYMMETRY
2 : the property of remaining invariant under certain changes (as of orientation in space, of the sign of the electric charge, of parity, or of the direction of time flow) -- used of physical phenomena and of equations describing them