/ Dictionary / Index P Pythagoreanism: Meaning and Definition of Find definitions for: Py•thag•o•re•an•ism Pronunciation: (pi-thag"u-rē'u-niz"um), [key] — n. the doctrines of Pythagoras and his followers, esp. the belief that the universe is the manifestation of various combinations of mathematical ratios. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Pythagorean Pythagorean scale Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language