Dictionary.net

• A room for the exhibition of wares for sale.

1914 - Nuttall's Standard dictionary of the English language
By Nuttall, P.Austin.

• A room where a tradesman or manufacturer displays his goods; to show forth, to manifest; to show off, to exhibit ostentatiously; to set off; to display one's self; to show up, to expose.

1874 - Etymological and pronouncing dictionary of the English language
By Stormonth, James, Phelp, P. H.