/ Dictionary / Index G great-niece: Meaning and Definition of Find definitions for: great-niece Pronunciation: (grāt'nēs"), [key] — n. a daughter of one's nephew or niece; grandniece. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: great-niece (Thesaurus) great-nephew Great Ouse Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language