Breadcrumb Home > 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: glissade Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language