/ Dictionary / Index N NGO: Meaning and Definition of Find definitions for: NGO Pronunciation: [key] National Gas Outlet. Nongovernmental Organization. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ngo (Thesaurus) NGNP Ngo Dinh Diem Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language