A proclamation is typically a very formal, official announcement by the government or by a ruler. For example: "President Trump signed a disaster proclamation for Texas." Proclamations are also somethings associated with kings and queens (royal proclamations). For example: "The king proclaimed that taxes would increase." An announcement is any kind of general public statement to a group of people. For example: "The host announced that the party was over." "The teacher announced that today class would be outside."