Is “Duality” a Scrabble word?

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Yes
DUALITY
Valid in at least one Scrabble dictionary

Valid in these dictionaries

SOWPODS / CSW
Scrabble UK & International
Valid
TWL / NWL
Scrabble North America
Valid
Large English Dictionary
General English word list
Valid

Meaning of Duality

/d(j)uːˈælɪti/

noun
  1. 1.A classification into two subclasses or opposed parts.

  2. 2.(projective geometry) The interchangeability of points and planes.

  3. 3.The mathematical equivalence of two seemingly different theoretical descriptions of a physical system.

Synonyms: dichotomy