Duality Definition
 do͝o-ălĭ-tē, dyo͝o- 
  dualities
  
    noun
  
 
    dualities
  
The quality or character of being twofold; dichotomy.
 American Heritage 
A classification into two subclasses or opposed parts.
Wiktionary 
(projective geometry) The interchangeability of points and planes.
Wiktionary 
(mathematics, physics) The mathematical equivalence of two seemingly different theoretical descriptions of a physical system.
Wiktionary 
Synonyms: 
  Other Word Forms of Duality
Noun
Singular:
 dualityPlural:
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