correctional

from WordNet (r) 3.0 (2006)

correctional
    adj 1: concerned with or providing correction; "a correctional
           institution"

from The Collaborative International Dictionary of English v.0.48

Correctional \Cor*rec"tion*al\ (k?r-r?k"sh?n-al), a. [Cf. F.
   correctionnel.]
   Tending to, or intended for, correction; used for correction;
   as, a correctional institution.
   [1913 Webster]