n. pl.   gal·ler·ies 1.  A roofed promenade, especially one extending along the wall of a building and supported by arches or columns on the outer side.
2.  A long enclosed passage, such as a hallway or corridor.
3. a.  A narrow balcony, usually having a railing or balustrade, along the outside of a building.
b.  A projecting or recessed passageway along an upper story on the interior or exterior of a large building, generally marked by a colonnade or arcade.
c.  Such a passageway situated over the aisle of a church and opening onto the nave. Also called  tribune2.
 4.  Southwestern Gulf States   See 
 veranda.
 5. a.  An upper section, often with a sloping floor, projecting from the rear or side walls of a theater or an auditorium to provide additional seating.
b.  The seats in such a section, usually cheaper than those on the main floor.
c.  The cheapest seats in a theater, generally those of the uppermost gallery.
d.  The audience occupying a gallery or cheap section of a theater.
 6.  A large audience or group of spectators, as at a tennis or golf match.
7.  The general public, usually considered as exemplifying a lack of discrimination or sophistication: accused the administration of playing to the gallery on the defense issue.
8. a.  A building, room, or website for the exhibition of artistic work.
b.  An establishment that displays and sells works of art.
c.  A photographer's studio.
 9.  A collection; an assortment: The trial featured a gallery of famous and flamboyant witnesses.
10. a.  An underground tunnel or passageway, as in a cave or one dug for military or mining purposes.
b.  A tunnel or series of tunnels made by an animal.
 11.  Nautical   A platform or balcony at the stern or quarters of some early sailing ships.
12.  A decorative upright trimming or molding along the edge of a table top, tray, or shelf.