The Collaborative International Dictionary of English v.0.48:

Allocution \Al`lo*cu"tion\, n. [L. allocuto, fr. alloqui to
   speak to; ad + loqui to speak: cf. F. allocution.]
   1. The act or manner of speaking to, or of addressing in
      words.
      [1913 Webster]

   2. An address; a hortatory or authoritative address as of a
      pope to his clergy. --Addison.
      [1913 Webster]

WordNet (r) 3.0 (2006):

allocution
    n 1: (rhetoric) a formal or authoritative address that advises
         or exhorts

Moby Thesaurus II by Grady Ward, 1.0:

46 Moby Thesaurus words for "allocution":
   address, after-dinner speech, chalk talk, debate, declamation,
   diatribe, eulogy, exhortation, filibuster, forensic,
   forensic address, formal speech, funeral oration, harangue,
   hortatory address, inaugural, inaugural address, invective,
   jeremiad, lecture, oration, pep talk, peroration, philippic, pitch,
   prepared speech, prepared text, public speech, reading, recital,
   recitation, sales talk, salutatory, salutatory address, say,
   screed, set speech, speech, speechification, speeching, talk,
   talkathon, tirade, valediction, valedictory, valedictory address