/ Dictionary / Index D dissertation: Meaning and Definition of Find definitions for: dis•ser•ta•tion Pronunciation: (dis"ur-tā'shun), [key] — n. a written essay, treatise, or thesis, esp. one written by a candidate for the degree of Doctor of Philosophy. any formal discourse in speech or writing. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: dissertation (Thesaurus) dissertate disserve Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language