mezzanine

noun

1. a low-ceilinged story between two main stories in a building, usually immediately above the ground floor and in the form of a balcony projecting only partly over the floor below it
   also mezzanine floor
2. in some theaters, the first few rows of the balcony, separated from the others by an aisle

Origin: Fr < It mezzanino < mezzano, middle < L medianus: see median