Source : Webster's Revised Unabridged Dictionary (1913)

Exclamation \Ex`cla*ma"tion\, n. [L. exclamatio: cf. F.
   exclamation.]
   1. A loud calling or crying out; outcry; loud or emphatic
      utterance; vehement vociferation; clamor; that which is
      cried out, as an expression of feeling; sudden expression
      of sound or words indicative of emotion, as in surprise,
      pain, grief, joy, anger, etc.

            Exclamations against abuses in the church. --Hooker.

            Thus will I drown your exclamations.  --Shak.

            A festive exclamation not unsuited to the occasion.
                                                  --Trench.

   2. (Rhet.) A word expressing outcry; an interjection; a word
      expressing passion, as wonder, fear, or grief.

   3. (Print.) A mark or sign by which outcry or emphatic
      utterance is marked; thus [!]; -- called also {exclamation
      point}.

Source : WordNet®

exclamation
     n 1: an abrupt excited utterance; "she gave an exclamation of
          delight"; "there was much exclaiming over it" [syn: {exclaiming}]
     2: a loud complaint or protest or reproach
     3: an exclamatory rhetorical device; "O tempore! O mores" [syn:
         {ecphonesis}]