Mezzanine

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.