being twofold; a classification into two opposed parts or subclasses;
"the dichotomy between eastern and western culture"
(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
(geometry) the interchangeability of the roles of points and planes in the theorems of projective geometry
- For many this duality is a source of anxiety.
- The duality of use value refers to its usefulness and rarity.
- It's also an example of duality at its most efficient level.