Meaning of supercity

su•per•cit•y

Pronunciation: (s'pur-sit"ē), [key]
— pl. -cit•ies.
  1. a large, heavily populated urban area that includes several cities; megalopolis.
  2. a very large city.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.