/ Dictionary / Index M M.N.A.: Meaning and Definition of Find definitions for: M.N.A. Pronunciation: [key] Master of Nursing Administration. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. MN M'Naghten test 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