/ Dictionary / Index D disunionist: Meaning and Definition of Find definitions for: dis•un•ion•ist Pronunciation: (dis-yn'yu-nist), [key] — n. a person who advocates or causes disunion. a secessionist during the period of the Civil War. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. disunion disunite Related Content Daily Word Quiz: reclusive Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language