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supercity

[soo-per-sit-ee]
noun, plural su·per·cit·ies.
  1. a large, heavily populated urban area that includes several cities; megalopolis.
  2. a very large city.
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Origin of supercity

An Americanism dating back to 1920–25; super- + city
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018