Dictionary 1. (a.) Established by a decree; definitive; settled.2. (a.) Serving to determine; critical. Thesaurus absolute binding commanding compelling compulsory conclusive decisive decretal decretive dictated dictating directive entailed final hard-and-fast imperative imposed instructive irrevocable jussive mandated mandating mandatory must obligating obligatory peremptory preceptive prescript prescriptive required ultimate without appeal |