The Collaborative International Dictionary of English v.0.48:

Promulgate \Pro*mul"gate\, v. t. [imp. & p. p. Promulgated; p.
   pr. & vb. n. Promulgating.] [L. promulgatus, p. p. of
   promulgare to promulgate; of unknown origin. Cf. Promulge.]
   To make known by open declaration, as laws, decrees, or
   tidings; to publish; as, to promulgate the secrets of a
   council.
   [1913 Webster]

   Syn: To publish; declare; proclaim. See Announce.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Announce \An*nounce"\, v. t. [imp. & p. p. Announced; p. pr. &
   vb. n. Announcing.] [OF. anoncier, F. annoncer, fr. L.
   annuntiare; ad + nuntiare to report, relate, nuntius
   messenger, bearer of news. See Nuncio, and cf.
   Annunciate.]
   [1913 Webster]
   1. To give public notice, or first notice of; to make known;
      to publish; to proclaim.
      [1913 Webster]

            Her [Q. Elizabeth's] arrival was announced through
            the country by a peal of cannon from the ramparts.
                                                  --Gilpin.
      [1913 Webster]

   2. To pronounce; to declare by judicial sentence.
      [1913 Webster]

            Publish laws, announce
            Or life or death.                     --Prior.
      [1913 Webster]

   Syn: To proclaim; publish; make known; herald; declare;
        promulgate.

   Usage: To Publish, Announce, Proclaim, Promulgate. We
          publish what we give openly to the world, either by
          oral communication or by means of the press; as, to
          publish abroad the faults of our neighbors. We
          announce what we declare by anticipation, or make
          known for the first time; as, to announce the speedy
          publication of a book; to announce the approach or
          arrival of a distinguished personage. We proclaim
          anything to which we give the widest publicity; as, to
          proclaim the news of victory. We promulgate when
          we proclaim more widely what has before been known by
          some; as, to promulgate the gospel.
          [1913 Webster]

WordNet (r) 3.0 (2006):

promulgate
    v 1: state or announce; "`I am not a Communist,' he exclaimed";
         "The King will proclaim an amnesty" [syn: proclaim,
         exclaim, promulgate]
    2: put a law into effect by formal declaration

Moby Thesaurus II by Grady Ward, 1.0:

73 Moby Thesaurus words for "promulgate":
   abide by, adhere to, administer, advertise, announce, annunciate,
   bid, blare, blare forth, blaze, blaze abroad, blazon, blazon about,
   broadcast, call on, call the signals, call upon, carry out,
   carry through, celebrate, charge, command, commission, complete,
   cry, cry out, declaim, declare, decree, dictate, direct, discharge,
   disseminate, effect, effectuate, enforce, enjoin, execute,
   fill out, fulfill, give an order, give the word, herald,
   herald abroad, honor, implement, instruct, issue a command,
   issue a writ, make, make out, mandate, observe, ordain, order,
   order about, proclaim, pronounce, prosecute, publish, put in force,
   put through, render, rule, say the word, shout, sound, thunder,
   thunder forth, toot, transact, trumpet, trumpet forth