mezzanine
US /ˈmet.sə.niːn/
UK /ˈmet.sə.niːn/
1.
soppalco, galleria
a low story between two main stories of a building, typically an intermediate floor between the ground floor and the first floor.
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The library has a beautiful mezzanine level with extra seating.
La biblioteca ha un bellissimo soppalco con posti a sedere extra.
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We watched the concert from the mezzanine seats.
Abbiamo guardato il concerto dai posti in galleria.