/ Dictionary / Index U Upper Silesia: Meaning and Definition of Find definitions for: Up'per Sile'sia Pronunciation: [key] a highly industrialized region divided between Germany and Poland after World War I. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. upper school Upper Tunguska 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