/ Dictionary / Index G grandpa: Meaning and Definition of Find definitions for: grand•pa Pronunciation: (gran'pä", -pô", grand'-, gram'-, gram'pu), [key] — n. Informal. grandfather. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: grandpa (Thesaurus) grand opera grandpapa Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language