Below are possible answers for the crossword clue Philosophical theory firs.
7 letter answer(s) to philosophical theory firs
ATOMISM
(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"
(psychology) a theory that reduces all mental phenomena to simple elements (sensations and feelings) that form complex ideas by association
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