SINCE 1828

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subbasement

noun sub·base·ment \ ˌsəb-ˈbās-mənt \

variants: or sub-basement

Definition of subbasement

plural subbasements or sub-basements

: 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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