The Collaborative International Dictionary of English v.0.48:

Declamation \Dec`la*ma"tion\, n. [L. declamatio, from declamare:
   cf. F. d['e]clamation. See Declaim.]
   1. The act or art of declaiming; rhetorical delivery;
      haranguing; loud speaking in public; especially, the
      public recitation of speeches as an exercise in schools
      and colleges; as, the practice declamation by students.
      [1913 Webster]

            The public listened with little emotion, but with
            much civility, to five acts of monotonous
            declamation.                          --Macaulay.
      [1913 Webster]

   2. A set or harangue; declamatory discourse.
      [1913 Webster]

   3. Pretentious rhetorical display, with more sound than
      sense; as, mere declamation.
      [1913 Webster]

WordNet (r) 3.0 (2006):

declamation
    n 1: vehement oratory
    2: recitation of a speech from memory with studied gestures and
       intonation as an exercise in elocution or rhetoric