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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.
Dualism denotes a state of two parts. The word's origin is the Latin duo, "two". The term 'dualism' was originally coined to denote co-eternal binary opposition, a meaning that is preserved in metaphysical and philosophical duality discourse but has been diluted in general or common usages.