I. noun 1. (usu. the Annunciation) — the announcement of the Incarnation by the angel Gabriel to Mary (Luke 1:26–38). 2. a Church festival commemorating the Annunciation, held on 25 March (Lady Day). 3. [ mass noun] —
‹archaic› the announcement of something
• the annunciation of a set of rules applying to the relationships between states.
– origin Middle English: from Old French annonciation, from late Latin annuntiatio(n-), from the verb annuntiare (see annunciate).