Source : Webster's Revised Unabridged Dictionary (1913)

Vocalization \Vo`cal*i*za"tion\, n.
   1. The act of vocalizing, or the state of being vocalized.

   2. The formation and utterance of vocal sounds.

Source : WordNet®

vocalization
     n 1: 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}, {vocalisation}, {phonation},
           {vox}]
     2: the use of uttered sounds for auditory communication [syn: {utterance}]