MEZZANINE

mezzanine, mezzanine floor, entresol

(noun) intermediate floor just above the ground floor

mezzanine, first balcony

(noun) first or lowest balcony

Source: WordNet® 3.1

Etymology

Noun

mezzanine (plural mezzanines)

A secondary floor, in between the main floors of a building; entresol.

A small window used to light such a secondary floor.

The lowest balcony in an auditorium.

Additional flooring laid over a floor to bring it up to some height or level.

(theatre) A floor under the stage, from which contrivances such as traps are worked.

Adjective

mezzanine (not comparable)

(engineering) Fulfilling an intermediate or secondary function.

Source: Wiktionary

Mez"za*nine, n. Etym: [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.

Source: Webster’s Unabridged Dictionary 1913 Edition