A proclamation (Lat. proclamare, to make public by announcement)'s an official declaration. British royal proclamations In English law, a proclamation's a formal announcement ("Royal Proclamation"), made under the great seal, of some matter which the King in Council or Queen in Council desires to make known to his or her subjects: for example, the declaration of war, the statement of neutrality, the summoning or dissolution of Parliament, or the bringing into operation of the provisions of some… (More on Proclamation)