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{{wiktionary|duality}}
'''Duality''' may refer to:
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==Mathematics==
* [[Duality (mathematics)]], a mathematical concept
** [[Dual (category theory)]], a formalization of mathematical duality
** [[Duality (optimization)]]
** [[Duality (order theory)]], a concept regarding binary relations
** [[Duality (projective geometry)]], general principle of projective geometry
** [[Duality principle (Boolean algebra)]], the extension of order-theoretic duality to Boolean algebras
** [[S-duality (homotopy theory)]]
* {{slink|List of dualities|Mathematics}}
==Philosophy, logic, and psychology==
* [[Dualistic cosmology]], a twofold division in several spiritual and religious worldviews
* [[Dualism (philosophy of mind)]], where the body and mind are considered to be irreducibly distinct
* [[De Morgan's laws]], specifically the ability to generate the dual of any logical expression
* Complementary duality of Carl Jung's functions and types in [[Socionics]]
* [[Duality (CoPs)]], refers to the notion of a duality in a Community of Practice
==Science==
===Electrical and mechanical===
* [[Duality (electrical circuits)]], regarding isomorphism of electrical circuits
* [[Duality (mechanical engineering)]], regarding isomorphism of some mechanical laws
===Physics===
* [[AdS/CFT correspondence]] (anti de Sitter/conformal field theory correspondence), sometimes called the Maldacena duality
* [[Dual resonance model]]
* [[Duality (electricity and magnetism)]]
* [[Englert–Greenberger duality relation]]
* [[Holographic duality]]
* [[Kramers–Wannier duality]]
* {{slink|List of dualities|Science: Physics}}
* [[Mirror symmetry (string theory)]]
* [[Montonen–Olive duality]]
* [[Mysterious duality]]
* [[String duality]],  a class of symmetries
** [[S-duality]]
** [[T-duality]]
** [[U-duality]]
* [[Wave–particle duality]]
==Music==
===Albums===
* [[Duality (Peter Leitch and John Hicks album)|''Duality'' (Peter Leitch and John Hicks album)]], 1994
* [[Duality (Lisa Gerrard and Pieter Bourke album)|''Duality'' (Lisa Gerrard and Pieter Bourke album)]], 1998
* [[Duality (Set It Off album)|''Duality'' (Set It Off album)]], 2014
* [[Duality (Ra album)|''Duality'' (Ra album)]], 2005
* [[Duality (mixtape)|''Duality'' (mixtape)]], 2012
* [[Duality (Luna Li album)|''Duality'' (Luna Li album)]], 2022
* [[Duality (Lindsey Stirling album)|''Duality'' (Lindsey Stirling album)]], 2024
* ''Duality'', a 2009 album by [[Darker Half]]
* ''Duality'', a 2020 album by [[Duke Dumont]]
* ''Duality'', a 2018 album by [[Big Scoob]]
===Songs===
* "Duality", a 2014 single from pop rock/punk rock band [[Set It Off (band)|Set It Off]]
* [[Duality (song)|"Duality" (song)]], a 2004 single by metal band Slipknot
* "Duality", a 2007 single from alternative rock/punk band [[Bayside (band)|Bayside]]
==Other==
* [[Duality (film)|''Duality'' (film)]], a 2001 Star Wars fan film by Dave Macomber and Mark Thomas
* Duality, a large format audio mixing console by [[Solid State Logic#Duality Console|Solid State Logic]]
* [[Dual (grammatical number)]], grammatical number that some languages use in addition to singular and plural
== See also ==
* [[Double (disambiguation)]]
* [[Dual (disambiguation)]]
* [[Duality principle (disambiguation)]]
* [[List of dualities]]: philosophy, mathematics, physics and engineering
* [[Nonduality (spirituality)|Nondualism]] (philosophy)
* [[Triality]] (mathematics)
{{disambiguation}}