/ Dictionary / Index U upper air: Meaning and Definition of Find definitions for: up'per air' Pronunciation: [key] — Meteorol. Meteorol. the atmosphere above the lower portion of the troposphere. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. upper Upper Arlington Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language