atomism

Noun
  1. (psychology) a theory that reduces all mental phenomena to simple elements (sensations and feelings) that form complex ideas by association (synset 106147550)
  2. (chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles (synset 106112083)
    "the ancient Greek philosophers Democritus and Epicurus held atomic theories of the universe"

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