/ Dictionary / Index E exclusionism: Meaning and Definition of Find definitions for: ex•clu•sion•ism Pronunciation: (ik-skl'zhu-niz"um), [key] — n. the principle, policy, or practice of exclusion, as from rights or privileges. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. exclusion clause exclusion principle Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language