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semibasement

[sem-ee-beys-muh nt, sem-ahy-, sem-ee-beys-, sem-ahy-]
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noun
  1. a basement partly above ground, as in a house built on a slope.
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Origin of semibasement

First recorded in 1870–75; semi- + basement
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018