The Collaborative International Dictionary of English v.0.48:

Disciplinary \Dis"ci*plin*a*ry\, a. [LL. disciplinarius
   flogging: cf. F. disciplinaire.]
   Pertaining to discipline; intended for discipline;
   corrective; belonging to a course of training.
   [1913 Webster]

         Those canons . . . were only disciplinary. --Bp. Ferne.
   [1913 Webster]

         The evils of the . . . are disciplinary and remedial.
                                                  --Buckminster.
   [1913 Webster]

WordNet (r) 3.0 (2006):

disciplinary
    adj 1: relating to discipline in behavior; "disciplinary
           problems in the classroom"
    2: relating to a specific field of academic study; "economics in
       its modern disciplinary sense"
    3: designed to promote discipline; "the teacher's action was
       corrective rather than instructional"; "disciplinal
       measures"; "the mother was stern and disciplinary" [syn:
       corrective, disciplinary, disciplinal]

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "disciplinary":
   autodidactic, castigatory, chastening, chastising, coeducational,
   corrective, cultural, didactic, edifying, educating, educational,
   educative, enlightening, exhortatory, grueling, homiletic,
   hortatory, illuminating, inflictive, informative, initiatory,
   instructive, introductory, lecturing, penal, penological,
   preaching, preceptive, propaedeutic, punishing, punitive, punitory,
   retributive, scholarly, scientific, self-teaching, teaching,
   technical, technicological, technological, tuitionary