Hypertext Webster Gateway: "duality"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Duality \Du"al"i*ty\, n. [L. dualitas: cf. F. dualit['e].]
The quality or condition of being two or twofold; dual
character or usage.
From WordNet (r) 1.7 (wn)
duality
n 1: being twofold; a classification into two opposed parts or
subclasses: "the dichotomy between eastern and western
culture" [syn: {dichotomy}]
2: (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 [syn: {wave-particle duality}]
3: (geometry) the interchangeability of the roles of points and
planes in the theorems of projective geometry
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