"atomism" in the noun sense

1. atomism

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

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"

Source: WordNet® (An amazing lexical database of English)

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