duality

1. n. The quality or condition of being two or twofold; dual character or usage. Source: opted

2. n. being twofold; a classification into two opposed parts or subclasses Source: wordnet

3. 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 Source: wordnet

4. n. (geometry) the interchangeability of the roles of points and planes in the theorems of projective geometry Source: wordnet

5. The quality or condition of being two or twofold; dual character or usage. Source: webster

6. The quality or condition of being two or twofold; dualcharacter or usage. Source: adambom

7. n:100 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 n. (geometry) the interchangeability of the roles of points and planes in the theorems of projective geometry Source: ecdict

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