1a room or building for the display or sale of works of art:an art gallerythe National Gallery
a collection of pictures:an extensive gallery of colour photographs
2a balcony or upper floor projecting from an interior back or side wall of a hall or church, providing space for an audience or musicians:in the minstrels' gallery, a string orchestra plays themes from film soundtracks
(the gallery) the highest balcony in a theatre, containing the cheapest seats.
a group of spectators, especially those at a golf tournament:he lashed a two-iron on to the green, bringing gasps from the gallery
3a long room or passage, typically one that is partly open at the side to form a portico or colonnade.
a horizontal underground passage, especially in a mine:long underground galleries of 3 km or more made it possible to mine under the sea
play to the gallery
act in an exaggerated way in order to appeal to popular taste.
late Middle English(in gallery (sense 3)): via Old French from Italian galleria 'gallery', formerly also 'church porch', from medieval Latin galeria, perhaps an alteration of galilea(see galilee)
Remember that gallery ends with -ery.
gallery in other Oxford dictionaries
Definition of gallery in the US English dictionary