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WordReference Random House Unabridged Dictionary of American English © 2024quan′tum the′ory, [Physics.]- Physicsany theory predating quantum mechanics that encompassed Planck's radiation formula and a scheme for obtaining discrete energy states for atoms, as Bohr theory.
- Physicsany theory that treats certain phenomena by the methods of quantum mechanics:a quantum theory of gravitation.
Collins Concise English Dictionary © HarperCollins Publishers:: quantum theory n - 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
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