/ Dictionary / Index U union scale: Meaning and Definition of Find definitions for: un'ion scale' Pronunciation: [key] scale (def. 6). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Union of Soviet Socialist Republics union shop Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language