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Meaning of semibasement

sem•i•base•ment

Pronunciation: (sem"ē-bās'munt, sem"ī-, sem'ē-bās"-, sem'ī-), [key]
— n.
  1. a basement partly above ground, as in a house built on a slope.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.