duality

du·al·i·ty  (d-l-t, dy-)

n.

The quality or character of being twofold; dichotomy.

Thesaurus

Noun	1.	duality - being twofold; a classification into two opposed parts or subclasses; "the dichotomy between eastern and western culture" dichotomy categorisation, categorization, classification - a group of people or things arranged by class or category
	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 wave-particle duality property - a basic or essential attribute shared by all members of a class; "a study of the physical properties of atomic particles" natural philosophy, physics - the science of matter and energy and their interactions; "his favorite subject was physics"
	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

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duality

noun dualism, dichotomy, polarity, doubleness, biformity, duplexity