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Topic: BUILDING

substructure

 noun
     
sub‧struc‧ture [countable]
1 one of the structures (structure1 (3)) within a society or organization that combines with others to form a whole
2TB a solid base under the ground that supports a building above the ground [↪ superstructure]
Definition of substructure from the Longman Dictionary of Contemporary English within
the topic BUILDING
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