/ Dictionary / Index U Universal Postal Union: Meaning and Definition of Find definitions for: U'niver'sal Post'al Un"ion Pronunciation: [key] an international organization, formed in Bern, Switzerland (1875), that administers and regulates international postal service. Abbr.: UPU&hasp; Formerly, Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. universal negative Universal Product Code Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language