DUALITY

du·al·i·ty

   /duˈælɪti, dyu-/ Show Spelled[doo-al-i-tee, dyoo-] Show IPA

noun

1.

a dual state or quality.

2.

Mathematics . a symmetry within a mathematical system such that a theorem remains valid if certain objects, relations, or operations are interchanged, as the interchange of points and lines in a plane in projective geometry.

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Origin:
1350–1400; Middle English dualitie < Late Latin duālitās. See dual, -ity

Related forms

non·du·al·i·ty, noun

 

Example Sentences

• Zurbaran painted with an acute sense of a duality between the world of flesh and blood and the world of the spirit.

• But what's really happening is the struggle of duality.

• We must have the duality of weapons expense and science engineering to remain a world leader for progress in all aspects.

 

World English Dictionary

duality (djuːˈælɪtɪ)
— n , pl -ties
1.	the state or quality of being two or in two parts; dichotomy
2.	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.	geometry the interchangeability of the roles of the point and the plane in statements and theorems in projective geometry