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.
1. To give public notice, or first notice of; to make known;
to publish; to proclaim.
Her [Q. Elizabeth's] arrival was announced through
the country by a peal of cannon from the ramparts.
2. To pronounce; to declare by judicial sentence.
Publish laws, announce
Or life or death. --Prior.
Syn: To proclaim; publish; make known; herald; declare;
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.