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]

Moby Thesaurus II by Grady Ward, 1.0:

69 Moby Thesaurus words for "exemplar":
   Geistesgeschichte, Hegelian idea, Kantian idea, Platonic form,
   Platonic idea, archetype, beau ideal, case, case in point, classic,
   complex idea, demonstration, emblem, eternal object,
   eternal universal, example, exemplification, explanation, exponent,
   formal cause, good example, highest category, history of ideas,
   ideal, idealism, ideate, ideatum, idee-force, illustration,
   innate idea, instance, man of men, masterpiece, masterwork, mirror,
   model, nonpareil, noosphere, noumenon, object lesson, paradigm,
   paragon, pattern, pattern of perfection, percept, prototype,
   quintessence, regulative first principle, relevant instance,
   representative, shining example, simple idea, soul, standard,
   subsistent form, symbol, the Absolute, the Absolute Idea,
   the Self-determined, the realized ideal, transcendent idea,
   transcendent nonempirical concept, transcendent universal, type,
   typical example, universal, universal concept, universal essence,
   very model