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Comprehensive
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atomism a theory that all matter is composed of small, indivisible particles called atoms, which in modern form is called atomic theory. [1/2 definitions]
monad a single indivisible physical unit or metaphysical entity, esp. in philosophy. [1/3 definitions]
quantum theory a theory in physics that energy radiates or is absorbed in discontinuous quantities, each a multiple of indivisible units or quanta.