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megastructure

[meg-uh-struhk-cher]
noun
  1. a very large, usually high-rise building or a complex of such buildings used for many purposes, as for apartments, offices, stores, theaters, and athletic facilities.
  2. a very large, complex organization.
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Origin of megastructure

First recorded in 1960–65; mega- + structure
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018