The Collaborative International Dictionary of English v.0.48:

Vociferate \Vo*cif"er*ate\, v. i. [L. vociferatus, p. p.
   vociferari to vociferate; vox, vocis, voice + ferre to bear.
   See Voice, and Bear to carry.]
   To cry out with vehemence; to exclaim; to bawl; to clamor.
   --Cowper.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Vociferate \Vo*cif"er*ate\, v. t. [imp. & p. p. Vociferated;
   p. pr. & vb. n. Vociferating.]
   To utter with a loud voice; to shout out.
   [1913 Webster]

         Though he may vociferate the word liberty. --V. Knox.
   [1913 Webster]

WordNet (r) 3.0 (2006):

vociferate
    v 1: utter in a very loud voice; "They vociferated their
         demands" [syn: vociferate, shout out]

Moby Thesaurus II by Grady Ward, 1.0:

19 Moby Thesaurus words for "vociferate":
   bellow out, call out, clamor, cry, cry out, holler, holler out,
   hollo, make an outcry, make an uproar, outcry, pipe up,
   raise a clamor, shout, shout out, shrill, sing out, yell,
   yell out