/ ˈmezəniːn; NAmE ; ˈmetsə-/ noun
1.
a floor that is built between two floors of a building and is smaller than the other floors :
a bedroom on the mezzanine
a mezzanine floor
2.
( NAmE ) the first area of seats above the ground floor in a theatre; the first few rows of these seats
—see also dress circle
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WORD ORIGIN
early 18th cent.: from French , from Italian mezzanino , diminutive of mezzano middle, from Latin medianus median.