Source : Webster's Revised Unabridged Dictionary (1913)

Discerning \Dis*cern"ing\, a.
   Acute; shrewd; sagacious; sharp-sighted. --Macaulay.

Discern \Dis*cern"\, v. t. [imp. & p. p. {Discerned}; p. pr. &
   vb. n. {Discerning}.] [F. discerner, L. discernere,
   discretum; dis- + cernere to separate, distinguish. See
   {Certain}, and cf. {Discreet}.]
   1. To see and identify by noting a difference or differences;
      to note the distinctive character of; to discriminate; to
      distinguish.

            To discern such buds as are fit to produce blossoms.
                                                  --Boyle.

            A counterfeit stone which thine eye can not discern
            from a right stone.                   --Robynson
                                                  (More's
                                                  Utopia).

   2. To see by the eye or by the understanding; to perceive and
      recognize; as, to discern a difference.

            And [I] beheld among the simple ones, I discerned
            among the youths, a young man void of understanding.
                                                  --Prov. vii.
                                                  7.

            Our unassisted sight . . . is not acute enough to
            discern the minute texture of visible objects.
                                                  --Beattie.

            I wake, and I discern the truth.      --Tennyson.

   Syn: To perceive; distinguish; discover; penetrate;
        discriminate; espy; descry; detect. See {Perceive}.

Source : WordNet®

discerning
     adj 1: having or revealing keen insight and good judgment; "a
            discerning critic"; "a discerning reader" [ant: {undiscerning}]
     2: unobtrusively perceptive and sympathetic; "a discerning
        editor"; "a discreet silence" [syn: {discreet}]
     3: quick to understand; "a kind and apprehensive friend"-
        Nathaniel Hawthorne [syn: {apprehensive}]
     4: able to make or detect effects of great subtlety; sensitive;
        "discerning taste"; "a discerning eye for color"