Duality

noun

du'ælɪti

Noun

being twofold; a classification into two opposed parts or subclasses
Similar:Dichotomy
Type of:CategorisationCategorizationClassification
(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
Type of:Property
(geometry) the interchangeability of the roles of points and planes in the theorems of projective geometry
Type of:FungibilityExchangeabilityInterchangeability