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"

Moby Thesaurus II by Grady Ward, 1.0:

135 Moby Thesaurus words for "peroration":
   PS, Parthian shot, Z, addendum, address, after-dinner speech,
   afterthought, allocution, apodosis, appendix, back matter,
   catastrophe, ceasing, cessation, chalk talk, chorus, coda, codicil,
   colophon, conclusion, consequence, consummation, continuance,
   continuation, crack of doom, culmination, curtain, curtains, death,
   debate, decease, declamation, denouement, destination, destiny,
   diatribe, doom, double take, dying words, effect, end, end point,
   ending, envoi, epilogue, eschatology, eulogy, exhortation,
   expiration, fate, filibuster, final solution, final twitch,
   final words, finale, finality, finis, finish, follow-through,
   follow-up, forensic, forensic address, formal speech,
   funeral oration, goal, harangue, hortatory address, inaugural,
   inaugural address, invective, izzard, jeremiad, last, last breath,
   last gasp, last things, last trumpet, last words, latter end,
   omega, oration, parting shot, payoff, pep talk, period, philippic,
   pitch, postface, postfix, postlude, postscript, prepared speech,
   prepared text, public speech, quietus, reading, recital,
   recitation, refrain, resolution, resting place, sales talk,
   salutatory, salutatory address, say, screed, second thought,
   sequel, sequela, sequelae, sequelant, sequent, sequitur,
   set speech, speech, speechification, speeching, stoppage,
   stopping place, subscript, suffix, supplement, swan song, tag,
   talk, talkathon, term, terminal, termination, terminus, tirade,
   valediction, valedictory, valedictory address, windup



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.