duality

Meanings

1. 1
   noun

   A classification into two subclasses or opposed parts.

   Moral duality.

2. 2
   noun

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

   Wave-particle duality.

3. 3
   noun

   (geometry) the interchangeability of the roles of points and planes in the theorems of projective geometry

4. 4
   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

From Latin duālitās. From dual + -ity.

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