What is the meaning of gallery?

noun

• Spectators at a golf or tennis match.
• A porch along the outside of a building (sometimes partly enclosed.
  • synonyms: veranda, verandah
• A room or series of rooms where works of art are exhibited.
  • synonyms: art gallery, picture gallery
• A long usually narrow room used for some specific purpose.
  • usage: "shooting gallery"
• A covered corridor (especially one extending along the wall of a building and supported with arches or columns. )
• Narrow recessed balcony area along an upper floor on the interior of a building; usually marked by a colonnade.
• A horizontal (or nearly horizontal) passageway in a mine.
  • usage: "they dug a drift parallel with the vein"
  • synonyms: drift, heading