1 subbasement | Definition of subbasement
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subbasement

noun
sub·​base·​ment | \ ˌsəb-ˈbās-mənt How to pronounce subbasement (audio) \
variants: or sub-basement
plural subbasements or sub-basements

Definition of subbasement

: a basement or an underground story located below the main basement of a building … describing in loving detail the enormous, complex structure from the bottom up, its subbasement … is full of gleaming pipes, turbines and boilers.— Burton Bernstein

First Known Use of subbasement

circa 1776, in the meaning defined above

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