The Collaborative International Dictionary of English v.0.48:

Discriminate \Dis*crim"i*nate\, v. t. [imp. & p. p.
   Discriminated; p. pr. & vb. n. Discriminating.]
   To set apart as being different; to mark as different; to
   separate from another by discerning differences; to
   distinguish. --Cowper.
   [1913 Webster]

         To discriminate the goats from the sheep. --Barrow.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Discriminating \Dis*crim"i*na`ting\, a.
   1. Marking a difference; distinguishing. --
      Dis*crim"i*na`ting*ly, adv.
      [1913 Webster]

            And finds with keen discriminating sight,
            Black's not so black; -- nor white so very white.
                                                  --Canning.
      [1913 Webster]

   2. making careful or fine distinctions, especially as to
      quality or accuracy; as, a discriminating observer.

   Syn: discerning, perspicacious. [PJC]

   3. having a refined taste or excellent judgment; as, a
      discriminating taste.
      [PJC]

WordNet (r) 3.0 (2006):

discriminating
    adj 1: showing or indicating careful judgment and discernment
           especially in matters of taste; "the discriminating eye
           of the connoisseur" [ant: indiscriminating,
           undiscriminating]
    2: having or demonstrating ability to recognize or draw fine
       distinctions; "an acute observer of politics and
       politicians"; "incisive comments"; "icy knifelike reasoning";
       "as sharp and incisive as the stroke of a fang"; "penetrating
       insight"; "frequent penetrative observations" [syn: acute,
       discriminating, incisive, keen, knifelike,
       penetrating, penetrative, piercing, sharp]