/ Dictionary / Index N Ni: Meaning and Definition of Find definitions for: Ni Pronunciation: [key] — Symbol, Chem. nickel. N.I. Pronunciation: [key] Northern Ireland. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ni (Thesaurus) NHTSA NIA Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language