Source : Webster's Revised Unabridged Dictionary (1913)

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

Source : WordNet®

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