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Definitions of duality:
  • noun:   (geometry) the interchangeability of the roles of points and planes in the theorems of projective geometry
  • noun:   (physics) the property of matter and electromagnetic radiation that is characterized by the fact that some properties can be explained best by wave theory and others by particle theory
  • noun:   being twofold; a classification into two opposed parts or subclasses

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See duality used in context: 10 poetry verses, 3 definitions

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