The Collaborative International Dictionary of English v.0.48:

Reichstag \Reichs"tag`\ (r?ks"t?g`), n. [G.]
   1. [Note: from the 1913 definition] The Diet, or House of
      Representatives, of the German empire (and of the Weimar
      Republic), which was composed of members elected for a
      term of three years by the direct vote of the people. This
      term is no longer (in 1997) applied to the German
      parliament. See also Bundesrath.
      [1913 Webster +PJC]

   2. [Note: from the 1913 definition] The national
      representative body of Hungary, consisting of a House of
      Magnates (including archdukes, peers, high officials of
      the Roman Catholic, Greek, and Protestant Churches, and
      certain other dignitaries) and a House of Representatives
      (in 1912 consisting of 453 members). See Legislative,
      Diet. [archaic]
      [Webster 1913 Suppl. +PJC]