/ Dictionary / Index F formal cause: Meaning and Definition of Find definitions for: for'mal cause' Pronunciation: (fôr'mul), [key] — Aristotelianism. Aristotelianism. See under(def. 8b). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. formal formaldehyde Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language