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The quality or character of being twofold; dichotomy.
n, pl -ties
1. the state or quality of being two or in two parts; dichotomy
2. (General Physics) physics the principle that a wave-particle duality exists in microphysics in which wave theory and corpuscular theory are complementary. The propagation of electromagnetic radiation is analysed using wave theory but its interaction with matter is described in terms of photons. The condition of particles such as electrons, neutrons, and atoms is described in terms of de Broglie waves
3. (Mathematics) geometry the interchangeability of the roles of the point and the plane in statements and theorems in projective geometry
du•al•i•ty(duˈæl ɪ ti, dyu-)
a dual state or quality; dualism.
[1350–1400; Middle English < Late Latin]
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|Noun||1.||duality - being twofold; a classification into two opposed parts or subclasses; "the dichotomy between eastern and western culture"|
|2.||duality - (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|
property - a basic or essential attribute shared by all members of a class; "a study of the physical properties of atomic particles"
|3.||duality - (geometry) the interchangeability of the roles of points and planes in the theorems of projective geometry|
exchangeability, fungibility, interchangeability, interchangeableness - the quality of being capable of exchange or interchange
geometry - the pure mathematics of points and lines and curves and surfaces