The Collaborative International Dictionary of English v.0.48:

Cabaret \Cab"a*ret\ (k[a^]b"[.a]*r[e^]t; 277), n. [F.]
   1. A tavern; a house where liquors are retailed. [Obs. as an
      English word.]
      [1913 Webster]

   2. A type of restaurant where liquor and dinner is served,
      and entertainment is provided, as by musicians, dancers,
      or comedians, and usually providing space for dancing by
      the patrons; -- similar to a nightclub. In some cases, the
      performers dance or sing on the floor between the tables,
      after the practice of a certain class of French taverns.
      The term cabaret is often used in the names of such an
      establishment.
      [Webster 1913 Suppl.]

   3. The type of entertainment provided in a cabaret[2].
      [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

cabaret
    n 1: a spot that is open late at night and that provides
         entertainment (as singers or dancers) as well as dancing
         and food and drink; "don't expect a good meal at a
         cabaret"; "the gossip columnist got his information by
         visiting nightclubs every night"; "he played the drums at a
         jazz club" [syn: cabaret, nightclub, night club,
         club, nightspot]
    2: a series of acts at a night club [syn: cabaret,
       floorshow, floor show]