mezzanine
US /ˈmet.sə.niːn/
UK /ˈmet.sə.niːn/

1.
mezanino, sobreloja
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.
A biblioteca tem um belo nível de mezanino com assentos extras.
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We watched the concert from the mezzanine seats.
Assistimos ao concerto dos assentos do mezanino.