/ Dictionary / Index U upper school: Meaning and Definition of Find definitions for: up'per school" Pronunciation: [key] a scholastic division, esp. in a private school, including the terminal secondary grades. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Upper Peninsula Upper Silesia 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