/ Dictionary / Index I illuminism: Meaning and Definition of Find definitions for: il•lu•mi•nism Pronunciation: (i-l'mu-niz"um), [key] — n. the doctrines or claims of Illuminati. a doctrine of enlightenment. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. illumine illuminometer Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language