The Collaborative International Dictionary of English v.0.48:

Proclamation \Proc`la*ma"tion\, n. [F. proclamation, L.
   proclamatio. See Proclaim.]
   [1913 Webster]
   1. The act of proclaiming; official or general notice;
      publication.
      [1913 Webster]

            King Asa made a proclamation throughout all Judah;
            none was exempted.                    --1 Kings xv.
                                                  22.
      [1913 Webster]

   2. That which is proclaimed, publicly announced, or
      officially declared; a published ordinance; as, the
      proclamation of a king; a Thanksgiving proclamation.
      [1913 Webster]

WordNet (r) 3.0 (2006):

proclamation
    n 1: a formal public statement; "the government made an
         announcement about changes in the drug war"; "a declaration
         of independence" [syn: announcement, proclamation,
         annunciation, declaration]
    2: the formal act of proclaiming; giving public notice; "his
       promulgation of the policy proved to be premature" [syn:
       proclamation, promulgation]

Moby Thesaurus II by Grady Ward, 1.0:

81 Moby Thesaurus words for "proclamation":
   advertisement, advertising, affirmance, affirmation, allegation,
   announcement, announcing, annunciation, appointment, assertion,
   asseveration, averment, avouchment, avowal, brevet, broadcast,
   broadcasting, bruiting about, bull, bulletin board, circular,
   communique, conclusion, creed, declaration, decree, decree-law,
   decreement, decretal, decretum, dictum, diktat, edict, edictum,
   encyclical, enunciation, fiat, heralding, ipse dixit, law,
   manifesto, notice, notification, ordinance, ordonnance, position,
   position paper, positive declaration, predicate, predication,
   proclaiming, profession, program, programma, promulgation,
   pronouncement, pronunciamento, proposition, protest, protestation,
   public notice, publication, publishing, report, rescript, rule,
   ruling, say, say-so, saying, senatus consult, senatus consultum,
   stance, stand, statement, ukase, utterance, vouch, white book,
   white paper, word



Bouvier's Law Dictionary, Revised 6th Ed (1856):

PROCLAMATION, practice. The declaration made by the cryer, by authority of
the court, that something is about to be done.
     2. It usually commences with the French word Oyez, do you hear, in
order to attract attention; it is particularly used on the meeting or
opening of the court, and at its adjournment; it is also frequently employed
to discharge persons who have been accused of crimes or misdemeanors.



Bouvier's Law Dictionary, Revised 6th Ed (1856):

PROCLAMATION, evidence. The act of causing some state matters to be
published or made generally known. A written or printed document in which
are contained such matters, issued by proper authority; as the president's
proclamation, the governor's, the mayor's proclamation. The word
proclamation is also used to express the public nomination made of any one
to a high office; as, such a prince was proclaimed emperor.
     2. The president's proclamation has not the force of law, unless when
authorized by congress; as if congress were to pass an act, which should
take effect upon the happening of a contingent event, which was to be
declared by the president by proclamation to hive happened; in this case the
proclamation would give the act the force of law, which, till then, it
wanted. How far a proclamation is evidence of facts, see Bac. Ab. Ev. F;
Dougl. 594, n; B. N. P. 226; 12 Mod. 216; 8 State Tr. 212; 4 M. & S. 546; 2
Camp. Rep. 44; Dane's Ab. eh. 96, a. 2, 3 and 4; 1 Scam. R. 577; Bro. h.t.