Etymology
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duality (n.)

"twofold nature, state of being two or divided in two," late 14c., from Late Latin dualitas, from Latin dualis "that contains two; the dual number, duality," from duo "two" (from PIE root *dwo- "two").

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Definitions of duality

duality (n.)
being twofold; a classification into two opposed parts or subclasses;
Synonyms: dichotomy
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;
Synonyms: wave-particle duality
duality (n.)
(geometry) the interchangeability of the roles of points and planes in the theorems of projective geometry;
From wordnet.princeton.edu