/ Dictionary / Index C CBO: Meaning and Definition of Find definitions for: CBO Pronunciation: [key] Congressional Budget Office. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. CBing CB radio Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language