/ Dictionary / Index D dissertate: Meaning and Definition of Find definitions for: dis•ser•tate Pronunciation: (dis'ur-tāt"), [key] — -tat•ed, -tat•ing. to discuss a subject fully and learnedly; discourse. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: dissertate (Thesaurus) dissert dissertation Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language