/ Dictionary / Index S supercity: Meaning and Definition of Find definitions for: su•per•cit•y Pronunciation: (s'pur-sit"ē), [key] — pl. -cit•ies. a large, heavily populated urban area that includes several cities; megalopolis. a very large city. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. supercilium superclass Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language