### Duality The opposite of polarity. When used as a religious term, it separates two opposites such as good and evil and places those characteristics into two completely separate God-forms.

### Duality • (n.) The quality or condition of being two or twofold; dual character or usage.
Found on http://thinkexist.com/dictionary/meaning/duality/

### duality wave-particle duality noun (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
Found on https://www.encyclo.co.uk/local/20974

### Duality [CoPs] In the context of a Community of practice the notion of a duality is used to capture the idea of the tension between two opposing forces which become a driving force for change and creativity. Wenger {Harv|Wenger|1998} uses the concept of dualities to examine the forces that create and sustain a Community of Practice. He describes a ...
Found on http://en.wikipedia.org/wiki/Duality_(CoPs)

### Duality [electrical circuits] In electrical engineering, electrical terms are associated into pairs called duals. A dual of a relationship is formed by interchanging voltage and current in an expression. The dual expression thus produced is of the same form, and the reason that the dual is always a valid statement can be traced to the duality of el...
Found on http://en.wikipedia.org/wiki/Duality_(electrical_circuits)

### Duality [electricity and magnetism] In physics, the electromagnetic dual concept is based on the idea that, in the static case, electromagnetism has two separate facets: electric fields and magnetic fields. Expressions in one of these will have a directly analogous, or dual, expression in the other. The reason for this can ultimately be traced to s...
Found on http://en.wikipedia.org/wiki/Duality_(electricity_and_magnetism)

### Duality [mathematics] In mathematics, a duality, generally speaking, translates concepts, theorems or mathematical structures into other concepts, theorems or structures, in a one-to-one fashion, often (but not always) by means of an involution operation: if the dual of A is B, then the dual of B is A. Such involutions sometimes have fixed points, ...
Found on http://en.wikipedia.org/wiki/Duality_(mathematics)

### Duality [mechanical engineering] In mechanical engineering, many terms are associated into pairs called duals. A dual of a relationship is formed by interchanging force (stress) and deformation (strain) in an expression. Here is a partial list of mechanical dualities: == Examples == === Constitutive relation === ...
Found on http://en.wikipedia.org/wiki/Duality_(mechanical_engineering)

### Duality [mixtape] Duality (stylized as Du∆lity), is the debut mixtape from Captain Murphy, the animated rapper alter-ego of experimental musician Flying Lotus. Initially released as a 34-minute short film featuring songs performed by Murphy as well as archived cult footage (including footage involving Heaven`s Gate co-founder Marshall Applewhite)...
Found on http://en.wikipedia.org/wiki/Duality_(mixtape)

### Duality [optimization] In mathematical optimization theory, duality means that optimization problems may be viewed from either of two perspectives, the primal problem or the dual problem (the duality principle). The solution to the dual problem provides a lower bound to the solution of the primal (minimization) problem. However in general the optim...
Found on http://en.wikipedia.org/wiki/Duality_(optimization)

### Duality [order theory] In the mathematical area of order theory, every partially ordered set P gives rise to a dual (or opposite) partially ordered set which is often denoted by Pop or Pd. This dual order Pop is defined to be the set with the inverse order, i.e. x ≤ y holds in Pop if and only if y ≤ x holds in P. It is easy to see that this con...
Found on http://en.wikipedia.org/wiki/Duality_(order_theory)

### Duality [projective geometry] A striking feature of projective planes is the `symmetry` of the roles played by points and lines in the definitions and theorems, and (plane) duality is the formalization of this metamathematical concept. There are two approaches to the subject of duality, one through language (the Principle of Duality) and the other ...
Found on http://en.wikipedia.org/wiki/Duality_(projective_geometry)

### Duality Du'al'i·ty noun [ Latin dualitas : confer French dualité .] The quality or condition of being two or twofold; dual character or usage.
Found on http://www.encyclo.co.uk/webster/D/127

### duality in mathematics, principle whereby one true statement can be obtained from another by merely interchanging two words. It is a property belonging to ... [5 related articles]
Found on http://www.britannica.com/eb/a-z/d/78

### Duality occurs where a building has two visual axis, which cause it to split into two equal and visually disturbing, parts. Where the duality exists but has been designed out for example by the use of decoration, the duality is said to be resolved.
Found on http://www.encyclo.co.uk/local/20935

### Duality See Logic, formal, §§ 1, 3, 7, 8.
Found on http://www.ditext.com/runes/d.html

### Duality The idea that each unit should be capable of at least two battlefield roles without compromising their efficiency. Duality works because overspecialization serves to make target priority easier for your opponent. (See also
Found on https://www.reddit.com/r/WarhammerCompetitive/comments/6ppyu3/a_glossary_of

### Duality The issuance of credit cards from both major bank card associations (Visa and MasterCard) by an individual bank.
Found on http://www.tedhaynes.com/newterms.html

### Duality The study and use of dual mathematical programs.
Found on http://glossary.computing.society.informs.org/index.php?page=D.html

### duality [n] - (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 2. [n] - (geometry) the interchangeability of the roles of points and planes in the theorems of projective geometry
Found on http://www.webdictionary.co.uk/definition.php?query=duality
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