Definitions for underbuilding
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Wiktionary
underbuilding(Noun)
A substructure; foundation; infrastructure.
Origin: From underbuild, equivalent to .
Webster Dictionary
Underbuilding(noun)
same as Substruction
Citation
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"underbuilding." Definitions.net. STANDS4 LLC, 2013. Web. 19 May 2013. <http://www.definitions.net/definition/underbuilding>.

