/ Dictionary / Index G great-grandson: Meaning and Definition of Find definitions for: great-grand•son Pronunciation: (grāt"gran'sun", -grand'-), [key] — n. a grandson of one's son or daughter. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: great-grandson (Thesaurus) great-grandparent great-granduncle Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language