The Collaborative International Dictionary of English v.0.48:

Discriminative \Dis*crim"i*na*tive\, a.
   1. Marking a difference; distinguishing; distinctive;
      characteristic.
      [1913 Webster]

            That peculiar and discriminative form of life.
                                                  --Johnson.
      [1913 Webster]

   2. Observing distinctions; making differences;
      discriminating. "Discriminative censure." --J. Foster.
      "Discriminative Providence." --Dr. H. More.
      [1913 Webster]

WordNet (r) 3.0 (2006):

discriminative
    adj 1: capable of making fine distinctions [syn:
           discriminative, discriminatory]
    2: expressing careful judgment; "discriminative censure"; "a
       biography ...appreciative and yet judicial in purpose"-Tyler
       Dennett [syn: discriminative, judicial]