The Collaborative International Dictionary of English v.0.48:

Catholicism \Ca*thol"i*cism\, n. [Cf. F. catholicisme.]
   [1913 Webster]
   1. The state or quality of being catholic or universal;
      catholicity. --Jer. Taylor.
      [1913 Webster]

   2. Liberality of sentiment; breadth of view.
      [1913 Webster]

   3. The faith of the whole orthodox Christian church, or
      adherence thereto.
      [1913 Webster]

   4. The doctrines or faith of the Roman Catholic church, or
      adherence thereto.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Catholicism
    n 1: the beliefs and practices of a Catholic Church [syn:
         Catholicism, Catholicity]