The Collaborative International Dictionary of English v.0.48:

Vocalism \Vo"cal*ism\ (v[=o]"kal*[i^]z'm), n.
   1. The exercise of the vocal organs; vocalization.
      [1913 Webster]

   2. A vocalic sound. [R.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

vocalism
    n 1: the system of vowels used in a particular language [syn:
         vowel system, vocalism]
    2: the sound made by the vibration of vocal folds modified by
       the resonance of the vocal tract; "a singer takes good care
       of his voice"; "the giraffe cannot make any vocalizations"
       [syn: voice, vocalization, vocalisation, vocalism,
       phonation, vox]