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understructure

[uhn-der-struhk-cher] /ˈʌn dərˌstrʌk tʃər/
noun
1.
a structure serving as a support; a base or foundation:
The building has a strong understructure.
2.
any thing, condition, etc., establishing support; a basis:
an argument that rests on a sound understructure of knowledge.
Origin
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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