An authoritative ban is a strong and legally binding prohibition on a certain matter. Some synonyms for the term include a mandatory restriction, an official decree, a mandatory edict, or a compulsory injunction. Other options that convey a similar degree of control and authority include prohibitive measures, a unilateral directive, a binding ordinance, or a non-negotiable embargo. The word "authoritative" implies that the ban has been enacted by an entity that possesses sufficient power and influence to ensure compliance, such as a government or regulatory authority. By using synonyms, writers can avoid repetition and add nuance and complexity to their descriptions of bans and restrictions.