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duality
 
Noun duality has 3 senses
  1. dichotomy, duality - being twofold; a classification into two opposed parts or subclasses; "the dichotomy between eastern and western culture"
    --1 is a kind of classification, categorization, categorisation
  2. duality, wave-particle duality - (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
    --2 is a kind of property
  3. duality - (geometry) the interchangeability of the roles of points and planes in the theorems of projective geometry
    --3 is a kind of     exchangeability, interchangeability, interchangeableness, fungibility
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