mezzanine

An intermediate floor or storey in between the main floors of a building; specifically, one that is directly above the ground floor which does not extend over the whole floorspace of the building, and so resembles a large balcony overlooking the ground floor; an entresol.

(US, Canada) The lowest balcony in an auditorium, cinema, theatre, etc.; the dress circle.

An apartment, room, etc., on such an intermediate floor.

(no longer used) Additional flooring laid over a floor to bring it up to some height or level.

(no longer used) In full mezzanine window: a small window at the height of a mezzanine floor or an attic, used to light these floors.

(no longer used) A floor under the stage, from which contrivances such as traps are worked.

Characteristic of or relating to high-interest loans which have no collateral, and are regarded as intermediate in nature, ranking above equity but below secured loans.

Fulfilling an intermediate or secondary function.

To fit (a building or other place) with a mezzanine floor.