#symmetricalness__symmetricalnes__correspondence__balance  (mathematics) an attribute of a shape; exact correspondence of form on opposite sides of a dividing line or plane
  exclusion:  #asymmetry
  supertype:  #spatial_property__spatialproperty__spatiality  any property relating to or occupying space
  subtype:  #geometrical_regularity__geometricalregularity__regularity  a property of polygons: the property of having equal sides and equal angles
  subtype:  #bilaterality__bilateralism__bilateral_symmetry__bilateralsymmetry  the property of being symmetrical about a vertical plane
  subtype:  #radial_symmetry__radialsymmetry  the property of symmetry about an axis; "the starfish illustrates radial symmetry"

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