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duality Twit Definition of duality Share Definition of duality on Facebook Digg:Definition of duality! stumble Definition of duality Bookmark Definition of duality on Delicious submit Definition of duality to reddit Bookmark Definition of duality
noun 
  1. A classification into two subclasses or opposed parts.
  2. (projective geometry) The interchangeability of points and planes.
  3. (mathematics), (physics) The mathematical equivalence of two seemingly different theoretical descriptions of a physical system
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