Pronunciation: (u-nun"sē-ā'shun),[key] —n. 1. (often cap.) the announcement by the angel Gabriel to the Virgin Mary of her conception of Christ.
2. (cap.) a representation of this in art.
3. (cap.) Also called Lady Day. the church festival on March 25 in memory of this.
4. an act or instance of announcing; proclamation: the annunciation of a new foreign policy.