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Definition of Substruction
1. n. Underbuilding; the foundation, or any preliminary structure intended to raise the lower floor or basement of a building above the natural level of the ground.
Definition of Substruction
1. Noun. (architecture) underbuilding; the foundation, or any preliminary structure intended to raise the lower floor or basement of a building above the natural level of the ground ¹
¹ Source: wiktionary.com