(a.) Conveying knowledge; serving to inform\; as, experience furnishes very instructive lessons.

admonitory advisory authoritative autodidactic binding canonical cautionary coeducational commanding communicative compelling consultative consultatory cultural decretal decretive decretory dictated dictating didactic directive disciplinary edifying educating educational educative enlightening exhortative exhortatory expostulative expostulatory formulary hard and fast helpful homiletic hortative hortatory illuminating imperative informational informative informing initiatory introductory jussive lecturing mandating mandatory monitorial monitory moralistic moralizing obligating official peremptory preaching preachy preceptive prescribed prescript prescriptive propaedeutic recommendatory regulation remonstrant remonstrative remonstratory revealing rubric self-teaching sententious standard statutory teaching tuitionary warning