/ Dictionary / Index P preestablished harmony: Meaning and Definition of Find definitions for: pre'estab'lished har'mony Pronunciation: [key] (in the philosophy of Leibnitz) synchronous operation of all monads, since their simultaneous creation, in accordance with the preexisting plan of God. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. preestablish preexilian Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language