semi-basement
Saysem-ee-BAYS-muhnt/ˌsɛmiˈbeɪsmənt/
- 1Alternative form of semibasement.
The architect tucked a semi-basement beneath the lobby to hold the building's boilers.
Their apartment was a cozy semi-basement that sat just below street level.
Note
Same room, different spelling: a basement sunk only partway below ground level rather than fully underground. The hyphen simply keeps the prefix semi- visible and changes nothing in meaning. The plural is formed on basement in the usual way, giving semi-basements. Either spelling is correct, but pick one and keep it consistent within a single text.
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