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• n  being twofold; a classification into two opposed parts or subclasses
• 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

• Society has always had this Taylor-sisters duality in its attitude toward young women.
• Entertaining the idea of mind-body duality invites the scorn of those who regard any attempt to dabble beyond the boundaries of conventional science as a waste of time.
• PRO: She took her Hannah Montana persona on the road for last year's Best of Both Worlds tour, which was either a high-tech examination of adolescent duality or an excuse for some .

• dichotomy
• wave-particle duality

News & Articles

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• Silver market duality
  Duality in trade in the precious metals markets has existed for decades. The decoupling has never been more obvious with the seeming dichotomy of prices versus demand and production.
  June 17, 2013 - Resource Investor

Quotes

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• Paul Greengrass in Forbes
  He's got a particular skill set as an actor that makes him perfect for this,Greengrass said. "He's a brilliant actor of duality. He's done it on a number of films back from the beginning. `Ripley's' a classic example. Because he's got that...
• David Shiner in Calgary Sun
  Shiner says Kooza "is about human connection and the world of duality of good and bad."
• Joann Alfano in Broadway World
  I couldn't be more excited about Drop Dead Diva,said JoAnn Alfano, Executive Vice President, Lifetime Networks. "It's the type of show that truly enhances The Lifetime brand - the duality of emotionally compelling drama with an equal...