Definition of: Pythagoreanism

(pi·thag′ə·rē′ən·iz′əm) noun
The mystical philosophy taught by Pythagoras, its central idea being that number is the essence of all things and the metaphysical principle of rational order in the universe. The leading theological doctrine was metempsychosis. [<L Pythagoreus <Gk. Pythagoreios <Pythagoras Pythagoras]