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Meaning of substructure

sub•struc•ture

Pronunciation: (sub-struk'chur, sub'struk"-), [key]
— n.
  1. a structure forming the foundation of a building or other construction.
  2. the foundations, piers, and abutments upon which the trusses or girders of the spans of a bridge rest.
  3. any basic structure or organization.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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