quantum mechanics
noun, plural in form but singular or plural in constructionDefinition of quantum mechanics
: 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 mechanics
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Merriam-Webster unabridged
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The first known use of quantum mechanics was in 1922
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