The Collaborative International Dictionary of English v.0.48:

Peroration \Per`o*ra"tion\, n. [L. peroratio, fr. perorate,
   peroratum, to speak from beginning to end; per + orate to
   speak. See Per-, and Oration.] (Rhet.)
   The concluding part of an oration; especially, a final
   summing up and enforcement of an argument. --Burke.
   [1913 Webster]

WordNet (r) 3.0 (2006):

peroration
    n 1: a flowery and highly rhetorical oration
    2: (rhetoric) the concluding section of an oration; "he
       summarized his main points in his peroration"

The Devil's Dictionary (1881-1906):

PERORATION, n.  The explosion of an oratorical rocket.  It dazzles,
but to an observer having the wrong kind of nose its most conspicuous
peculiarity is the smell of the several kinds of powder used in
preparing it.