Synonyms and related words :
authoritative, autodidactic, binding, canonical, coeducational, commanding, compelling, cultural, decretal, decretive, decretory, dictated, dictating, didactic, directive, disciplinary, edifying, educating, educational, educative, enlightening, exhortatory, formulary, hard and fast, homiletic, hortatory, illuminating, imperative, informative, initiatory, instructive, introductory, jussive, lecturing, mandating, mandatory, obligating, official, peremptory, preaching, prescribed, prescript, prescriptive, propaedeutic, regulation, rubric, self-teaching, standard, statutory, teaching, tuitionary