/ Dictionary / Index U U.B.: Meaning and Definition of Find definitions for: U.B. Pronunciation: [key] United Brethren. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. UAW Ubangi Related Content Daily Word Quiz: diaphanous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language