quantum mechanics
noun plural but singular or plural in construction Date: 1922 a theory of matter that is based on the concept of the possession of wave properties by elementary particles, that affords a mathematical interpretation of the structure and interactions of matter on the basis of these properties, and that incorporates within it quantum theory and the uncertainty principle — called also wave mechanicsquantum mechanical adjectivequantum mechanically adverb

New Collegiate Dictionary. 2001.

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