/ Dictionary / Index N nondisjunction: Meaning and Definition of Find definitions for: non•dis•junc•tion Pronunciation: (non"dis-jungk'shun), [key] — n. Biol. the failure of chromosomes to separate and segregate into daughter cells at division. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: nondisjunction (Thesaurus) nondirective therapy nondistinctive Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language