/ Dictionary / Index N N.A.S.: Meaning and Definition of Find definitions for: N.A.S. Pronunciation: [key] See naval air station. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: nas (Thesaurus) nary NASA Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language