/ Dictionary / Index I ICAO: Meaning and Definition of Find definitions for: ICAO Pronunciation: [key] International Civil Aviation Organization. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: icao (Thesaurus) -ically Icaria Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language