1. [ noun ] (psychology) a theory that reduces all mental phenomena to simple elements (sensations and feelings) that form complex ideas by association
Related terms: scientific_theory psychology
2. [ noun ] (chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles
Synonyms: atomist_theory atomistic_theory atomic_theory

"the ancient Greek philosophers Democritus and Epicurus held atomic theories of the universe"

Related terms: holism theory chemistry
Similar spelling:   atomise