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quantum theory

noun, Physics.
any theory predating quantum mechanics that encompassed Planck's radiation formula and a scheme for obtaining discrete energy states for atoms, as Bohr theory.
any theory that treats certain phenomena by the methods of quantum mechanics:
a quantum theory of gravitation.
Origin of quantum theory
1910-15 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for quantum theory
  • But despite a slow start, the field seems to be on the verge of yielding real advances in quantum theory and engineering.
  • Among the lesser effects of quantum theory are gaping holes in old ideas about causality.
  • The relativity theory and the quantum theory were included among the latter.
  • For one thing, good as quantum theory and relativity are at explaining things, neither can be explained in terms of the other.
  • Both its awards were given for more obscure work on arcane but important aspects of quantum theory.
  • quantum theory allows subatomic particles to exist in more than one state simultaneously, a phenomenon known as superposition.
  • Instead, it is the keys used to encrypt the data that rely on quantum theory.
  • The solution to the density-fluctuation problem is more subtle, and goes back to quantum theory.
  • Some bits of it, say much of quantum theory, are so bizarre that they defy metaphor and only make sense mathematically.
  • By starting in the middle, our facts have led us to the subatomic and quantum theory.
British Dictionary definitions for quantum theory

quantum theory

a theory concerning the behaviour of physical systems based on Planck's idea that they can only possess certain properties, such as energy and angular momentum, in discrete amounts (quanta). The theory later developed in several equivalent mathematical forms based on De Broglie's theory and on the Heisenberg uncertainty principle See wave mechanics
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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quantum theory in Medicine

quantum theory n.
The theory that radiant energy is transmitted in the form of discrete units.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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quantum theory in Science
quantum theory  
  1. See quantum mechanics.

  2. Any of various theories that makes use of the assumptions, principles, and laws of quantum mechanics.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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