/ Dictionary / Index G grandniece: Meaning and Definition of Find definitions for: grand•niece Pronunciation: (gran'nēs", grand'-), [key] — n. a daughter of one's nephew or niece. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: grandniece (Thesaurus) grandnephew grand old man 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