mezzanine

US /ˈmet.sə.niːn/
UK /ˈmet.sə.niːn/
"mezzanine" picture
1.

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.
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We watched the concert from the mezzanine seats.
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