The Collaborative International Dictionary of English v.0.48:

Exclaim \Ex*claim"\, v. t. & i. [imp. & p. p. Exclaimed; p.
   pr. & vb. n. Exclaiming.] [L. exclamare, exclamatum; ex +
   clamare to cry out; cf. OF. exclamer. See Clam.]
   To cry out from earnestness or passion; to utter with
   vehemence; to call out or declare loudly; to protest
   vehemently; to vociferate; to shout; as, to exclaim against
   oppression with wonder or astonishment; "The field is won!"
   he exclaimed.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Exclaim \Ex*claim"\, n.
   Outcry; clamor. [Archaic]
   [1913 Webster]

         Cursing cries and deep exclaims.         --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

exclaim
    v 1: utter aloud; often with surprise, horror, or joy; "`I won!'
         he exclaimed"; "`Help!' she cried"; "`I'm here,' the mother
         shouted when she saw her child looking lost" [syn:
         exclaim, cry, cry out, outcry, call out, shout]
    2: state or announce; "`I am not a Communist,' he exclaimed";
       "The King will proclaim an amnesty" [syn: proclaim,
       exclaim, promulgate]