mezzanine Definition

mezzanine
noun mezzanines

1. archit.
In a building: a small storey between two main floors, usually the ground and first floors.
2a. theat.
A room or floor below the stage;
(N Amer)
2b. theat.
The first balcony; the circle. Also as adj.
Example: mezzanine floor

Etymology: 18c: French, from Italian mezzanino, from mezzano middle.