/ Dictionary / Index N NMI: Meaning and Definition of Find definitions for: NMI Pronunciation: [key] no middle initial. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. NM NMN Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language