What does annunciation mean?
The definition of annunciation
An*nun`ci*a”tion, n.
Etym: [L. annuntiatio: cf. F. annonciation.]

1 The act of announcing; announcement; proclamation; as, the annunciation of peace.
2 (Eccl.)

(a) The announcement of the incarnation, made by the angel Gabriel to the Virgin Mary.
(b) The festival celebrated (March 25th) by the Church of England, of Rome, etc., in memory of the angel’s announcement, on that day; Lady Day.