/ Dictionary / Index U UNCIO: Meaning and Definition of Find definitions for: UNCIO Pronunciation: [key] United Nations Conference on International Organization. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. uncinate process uncircumcised Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language