duality
definition: (geometry) the interchangeability of the roles of points and planes in the theorems of projective geometry
example:
speech part: noun
synonyms:
definition: (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
example:
speech part: noun
synonyms:
wave-particle duality
definition: being twofold
example:
speech part: noun
synonyms:
dichotomy