/ Dictionary / Index N niner: Meaning and Definition of Find definitions for: nin•er Pronunciation: (nī'nur), [key] — n. Slang. nine. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: niner (Thesaurus) nine plus zero array nine-spot Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language