quantum theory ( synonym found)
Definition of quantum theory:

(n) : a theory developed in early 20th century, according to which nuclear and radiation phenomena can be explained by assuming that energy only occurs in discrete amounts called quanta. In current usage quantum theory may refer, in addition to the "old" quantum theory, to any or all of the following:
Definition of quantum theory:

(n) : a theory developed in early 20th century, according to which nuclear and radiation phenomena can be explained by assuming that energy only occurs in discrete amounts called quanta. In current usage quantum theory may refer, in addition to the "old" quantum theory, to any or all of the following:
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