[ meg-uh-struhk-cher ]
/ ˈmɛg əˌstrʌk tʃər /


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.
a very large, complex organization.

Origin of megastructure

First recorded in 1960–65; mega- + structure Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020