noun (n)

• (mathematics) an attribute of a shape or relation; exact reflection of form on opposite sides of a dividing line or plane(noun.attribute)

  Synonym:
  balance, correspondence, symmetricalness
  Antonym:
  asymmetry, dissymmetry, imbalance
  

  source: wordnet30
• balance among the parts of something(noun.shape)

  Synonym:
  proportion
  Antonym:
  disproportion
  

  source: wordnet30
• (physics) the property of being isotropic; having the same value when measured in different directions(noun.attribute)

  Synonym:
  isotropy
  Antonym:
  anisotropy
  

  source: wordnet30
• A due proportion of the several parts of a body to each other; adaptation of the form or dimensions of the several parts of a thing to each other; the union and conformity of the members of a work to the whole.(noun)

  source: webster1913