The Collaborative International Dictionary of English v.0.48:

Preceptive \Pre*cep"tive\, a. [L. praeceptivus.]
   Containing or giving precepts; of the nature of precepts;
   didactic; as, the preceptive parts of the Scriptures.
   [1913 Webster]

         The lesson given us here is preceptive to us.
                                                  --L'Estrange.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

51 Moby Thesaurus words for "preceptive":
   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