/ Dictionary / Index N niece: Meaning and Definition of Find definitions for: niece Pronunciation: (nēs), [key] — n. a daughter of a person's brother or sister. a daughter of a person's spouse's brother or sister. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: niece (Thesaurus) Niebuhr Niedersachsen Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language