Duality

ahd-5
  • noun. The quality or character of being twofold; dichotomy.
    • The Century Dictionary and Cyclopedia
  • noun. The state of being two, or of being divided into two; twofold division or character; twoness.
    • the GNU version of the Collaborative International Dictionary of English
  • noun. The quality or condition of being two or twofold; dual character or usage.
    • Wiktionary, Creative Commons Attribution/Share-Alike License
  • noun. A classification into two subclasses or opposed parts.
  • noun. The interchangeability of points and planes.
  • noun. The mathematical equivalence of two seemingly different theoretical descriptions of a physical system.
    • WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
  • noun. (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
  • noun. being twofold; a classification into two opposed parts or subclasses
  • noun. (geometry) the interchangeability of the roles of points and planes in the theorems of projective geometry
    • Word Usage
    "This duality is a manifestation of assumptions about the relationship between objects and ideas, much as Schäffer's color charts were, and they are limiting in similar ways. reference"
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