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duality has 2 distinct synonyms spread across 2 of its 3 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
being twofold; a classification into two opposed parts or subclasses
“the dichotomy between eastern and western culture”
(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, antonyms and the broader and narrower relations for duality come from Princeton University’s WordNet. Full sources and licences.
(geometry) the interchangeability of the roles of points and planes in the theorems of projective geometry