\Mez"za*nine\, n. [F. mezzanine, It. mezzanino, fr.
mezzano middle, fr. mezzo middle, half. See {Mezzo}.] (Arch.)
(a) Same as {Entresol}.
(b) A partial story which is not on the same level with the
    story of the main part of the edifice, as of a back
    building, where the floors are on a level with landings
    of the staircase of the main house.

\Mez"za*nine\, n.
1. A flooring laid over a floor to bring it up to some height
   or level.

2. Also

{mezzanine floor}. (Theat.) A floor under the stage, from
   which various contrivances, as traps, are worked.