Source : Webster's Revised Unabridged Dictionary (1913)

Declaim \De*claim"\, v. i. [imp. & p. p. {Declaimed}; p. pr. &
   vb. n. {Declaiming}.] [L. declamare; de- + clamare to cry
   out: cf. F. d['e]clamer. See {Claim}.]
   1. To speak rhetorically; to make a formal speech or oration;
      to harangue; specifically, to recite a speech, poem, etc.,
      in public as a rhetorical exercise; to practice public
      speaking; as, the students declaim twice a week.

   2. To speak for rhetorical display; to speak pompously,
      noisily, or theatrically; to make an empty speech; to
      rehearse trite arguments in debate; to rant.

            Grenville seized the opportunity to declaim on the
            repeal of the stamp act.              --Bancroft.

Declaim \De*claim"\, v. t.
   1. To utter in public; to deliver in a rhetorical or set
      manner.

   2. To defend by declamation; to advocate loudly. [Obs.]
      ``Declaims his cause.'' --South.

Source : WordNet®

declaim
     v 1: recite in elocution [syn: {recite}]
     2: speak against in an impassioned manner; "he declaimed
        against the wasteful ways of modern society" [syn: {inveigh}]