Proclamation (noun)

1. An official or public announcement.
2. A formal or public statement made by a person in authority or by a government.
3. A statement or announcement made publicly or officially, often in a formal manner.

Origin:

From middle english proclamacioun, from old french proclamacion, from latin proclāmatiō, from proclāmō ("shout out, announce").

Examples:

1. The king issued a proclamation declaring war.
2. The mayor made a proclamation declaring the day as a city holiday.
3. The proclamation was read in the town square.
4. The government issued a proclamation banning the sale of certain goods.
5. He made a proclamation of his intentions to run for office.