The Collaborative International Dictionary of English v.0.48:

Exemplar \Ex*em"plar\, n. [L. exemplar, exemplum: cf. F.
   exemplaire. See Example, and cf. Examper, Sampler.]
   1. A model, original, or pattern, to be copied or imitated; a
      specimen; sometimes; an ideal model or type, as that which
      an artist conceives.
      [1913 Webster]

            Such grand exemplar as make their own abilities the
            sole measure of what is fit or unfit. --South.
      [1913 Webster]

   2. A copy of a book or writing. [Obs.] --Udall.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Exemplar \Ex*em"plar\, a.
   Exemplary. [Obs.]
   [1913 Webster]

         The exemplar piety of the father of a family. --Jer.
                                                  Taylor.
   [1913 Webster]

WordNet (r) 3.0 (2006):

exemplar
    n 1: something to be imitated; "an exemplar of success"; "a
         model of clarity"; "he is the very model of a modern major
         general" [syn: exemplar, example, model, good
         example]