an·nounce / əˈnouns/ • v. [tr.] make a public and typically formal declaration about a fact, occurrence, or intention: the president's office announced that the state of siege would be lifted he announced his retirement from football. ∎  make known: we announce our failures by warring against ourselves and others. ∎  give information about (transportation) in a station or airport via a public address system: they were announcing her train. ∎  (of a notice, letter, sound, etc.) give information to (someone) via the senses of sight or hearing: storms came announced by long wisps that lashed out from a snow cloud's body. ∎  make known the arrival or imminence of (a guest or a meal) at a formal social occasion: dinner was announced.

an·nounce·ment / əˈnounsmənt/ • n. a public and typically formal statement about a fact, occurrence, or intention: the spokesperson was about to make an announcement. ∎  the action of making such a statement: the announcement of the decision of the president. ∎  a notice appearing in a newspaper or public place and announcing something such as a birth, death, or marriage. ∎  a statement of information given over a public address system: a loudspeaker announcement echoed across the field.

announce XV (rare before XVIII). — AN. an(o)uncer, OF. anoncier (mod. annoncer) :- L. annuntiāre, f. AN-1 + nuntius (cf. ANNUNCIATION, NUNCIO).
Hence announcement XVIII.