/ Dictionary / Index N NBA: Meaning and Definition of Find definitions for: NBA Pronunciation: [key] National Basketball Association. See National Boxing Association. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. NB NBC Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language