Etymology
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basement (n.)

"lowest story of a building, wholly or partly underground," 1730, from base (v.) + -ment.

updated on April 08, 2017

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Definitions of basement from WordNet

basement (n.)
the lowermost portion of a structure partly or wholly below ground level; often used for storage;
Synonyms: cellar
basement (n.)
the ground floor facade or interior in Renaissance architecture;
From wordnet.princeton.edu, not affiliated with etymonline.