WordReference Random House Unabridged Dictionary of American English © 2026
meg•a•struc•ture
(meg′ə struk′chər),USA pronunciation n.
- 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.
- mega- + structure 1960–65