quantum theory

[ kwon-tuhm thee-uh-ree, theer-ee ]

noun

, Physics.

1. any theory predating quantum mechanics that encompassed Planck's radiation law and a scheme for obtaining discrete energy states for atoms, such as the Bohr model.
2. any theory that treats certain phenomena by the methods of quantum mechanics:

   a quantum theory of gravitation.

quantum theory

noun

1. 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

quantum theory

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

Word History and Origins

Origin of quantum theory¹

First recorded in 1910–15

Example Sentences

For that reason, researchers have developed a framework to describe quantum theory in combination with general relativity.

From The Daily Beast

Quantum theory explains the small stuff, where matter and energy divide into infinitesimal particles.

From The Daily Beast

In that way, it incorporates both classical physics and quantum theory to explain the most general range of phenomena yet.

From The Daily Beast