The Collaborative International Dictionary of English v.0.48:

Arcade \Ar*cade"\, n. [F. arcade, Sp. arcada, LL. arcata, fr. L.
   arcus bow, arch.]
   1. (Arch.)
      (a) A series of arches with the columns or piers which
          support them, the spandrels above, and other necessary
          appurtenances; sometimes open, serving as an entrance
          or to give light; sometimes closed at the back (as in
          the cut) and forming a decorative feature.
      (b) A long, arched building or gallery.
          [1913 Webster]

   2. An arched or covered passageway or avenue.
      [1913 Webster]

WordNet (r) 3.0 (2006):

arcade
    n 1: a covered passageway with shops and stalls on either side
    2: a structure composed of a series of arches supported by
       columns [syn: arcade, colonnade]

The Free On-line Dictionary of Computing (19 January 2023):

Arcade

    A UK BBS for the Acorn Archimedes.  Also
   has links with Demon Internet.

   Telephone: +44 (181) 654 2212 (24hrs, most speeds).

   (1994-11-08)