Noun
- 1. atomism, scientific theory
- usage: (psychology) a theory that reduces all mental phenomena to simple elements (sensations and feelings) that form complex ideas by association
- 2. atomism, atomic theory, atomist theory, atomistic theory, theory
- usage: (chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles; "the ancient Greek philosophers Democritus and Epicurus held atomic theories of the universe"
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