An authoritative proclamation is a statement made with the intention of being recognized as the final or official decision on a matter. Synonyms for the phrase include a decree, edict, proclamation, or announcement. These words often indicate a level of command that is backed by legal or social power. Declaration, ordinance, and ruling also fall in line with this category of phrases. The word 'pronouncement,' on the other hand, might be used in a more casual setting or personal opinion. Authoritative proclamations are often made by those in positions of authority, including government officials, leaders, and individuals with specific duties and responsibilities.