Pythagorism \Py*thag"o*rism\, n. [Gr. ?.] The doctrines taught by Pythagoras. [1913 Webster] Note: Pythagoras made numbers the basis of his philosophical system, as well physical as metaphysical. The doctrine of the transmigration of souls (metempsychosis) is associated closely with name of Pythagoras. [1913 Webster]