/ Dictionary / Index D disunion: Meaning and Definition of Find definitions for: dis•un•ion Pronunciation: (dis-yn'yun), [key] — n. a severance of union; separation; disjunction. lack of unity; dissension. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: disunion (Thesaurus) disunify disunionist 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