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Meaning of megastructure

meg•a•struc•ture

Pronunciation: (meg'u-struk"chur), [key]
— n.
  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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.