Quantum Theory noun [U] ( physics ) a theory that based on the idea that energy can only be changed in units that cannot be divided.
**Quantum Physics **noun [U] the branch of science that investiges the principles of QUANTUM THEORY to understand the behaviour of PARTICLES at the ATOM and SUB-ATOM level
Quantum mechanics noun [U] ( physics ) the branch of MECHANICS that deals with movement and force in pieces of matter smaller than ATOMS
Quantum noun (plural quanta) ( physics ) a very small quantity of ELECTROMAGNETIC energy.
Quantum leap noun a sudden, great and import change, improvement or development