From Webster's Revised Unabridged Dictionary (1913) :

  Gallery \Gal"ler*y\, n.; pl. Galleries. [F. galerie, It.
     galleria, fr. LL. galeria gallery, perh. orig., a festal
     hall, banquetting hall; cf. OF. galerie a rejoicing, fr.
     galer to rejoice. Cf. Gallant, a.]
     1. A long and narrow corridor, or place for walking; a
        connecting passageway, as between one room and another;
        also, a long hole or passage excavated by a boring or
        burrowing animal.
  
     2. A room for the exhibition of works of art; as, a picture
        gallery; hence, also, a large or important collection of
        paintings, sculptures, etc.
  
     3. A long and narrow platform attached to one or more sides
        of public hall or the interior of a church, and supported
        by brackets or columns; -- sometimes intended to be
        occupied by musicians or spectators, sometimes designed
        merely to increase the capacity of the hall.
  
     4. (Naut.) A frame, like a balcony, projecting from the stern
        or quarter of a ship, and hence called stern gallery or
        quarter gallery, -- seldom found in vessels built since
        1850.
  
     5. (Fort.) Any communication which is covered overhead as
        well as at the sides. When prepared for defense, it is a
        defensive gallery.
  
     6. (Mining) A working drift or level.
  
     Whispering gallery. See under Whispering.  
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