/ Dictionary / Index G great-grandparent: Meaning and Definition of Find definitions for: great-grand•par•ent Pronunciation: (grāt"gran'pâr"unt, -par"-, -grand'-), [key] — n. a grandfather or grandmother of one's father or mother. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: great-grandparent (Thesaurus) great-grandniece great-grandson 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