The Collaborative International Dictionary of English v.0.48:

Cabala \Cab"a*la\ (k[a^]b"[.a]*l[.a]), n. [LL. See Cabal, n.]
   1. A kind of occult theosophy or traditional interpretation
      of the Scriptures among Jewish rabbis and certain
      medi[ae]val Christians, which treats of the nature of god
      and the mystery of human existence. It assumes that every
      letter, word, number, and accent of Scripture contains a
      hidden sense; and it teaches the methods of interpretation
      for ascertaining these occult meanings. The cabalists
      pretend even to foretell events by this means.
      [1913 Webster]

   2. Secret science in general; mystic art; mystery.
      [1913 Webster]

WordNet (r) 3.0 (2006):

cabala
    n 1: an esoteric or occult matter resembling the Kabbalah that
         is traditionally secret [syn: cabala, cabbala,
         cabbalah, kabala, kabbala, kabbalah, qabala,
         qabalah]
    2: an esoteric theosophy of rabbinical origin based on the
       Hebrew scriptures and developed between the 7th and 18th
       centuries [syn: Kabbalah, Kabbala, Kabala, Cabbalah,
       Cabbala, Cabala, Qabbalah, Qabbala]