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English to English noun
| 1 |
being twofold; a classification into two opposed parts or subclasses |  | Example: the dichotomy between eastern and western culture
source: wordnet30
| 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 | | source: wordnet30
| 3 |
(geometry) the interchangeability of the roles of points and planes in the theorems of projective geometry | | source: wordnet30
| 4 |
The quality or condition of being two or twofold; dual character or usage. | | source: webster1913
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