The Collaborative International Dictionary of English v.0.48:

Replica \Rep"li*ca\ (r?p"l?-k?), n. [It. See Reply, v. & n.]
   [1913 Webster]
   1. (Fine Arts) A copy of a work of art, as of a picture or
      statue, made by the maker of the original.
      [1913 Webster]

   2. (Mus.) Repetition.
      [1913 Webster]

WordNet (r) 3.0 (2006):

replica
    n 1: copy that is not the original; something that has been
         copied [syn: replica, replication, reproduction]

Moby Thesaurus II by Grady Ward, 1.0:

49 Moby Thesaurus words for "replica":
   Doppelganger, actual thing, burlesque, carbon copy, clone, copy,
   counterpart, dead ringer, ditto, double, dummy, dupe, duplicate,
   duplication, equivalent, exact counterpart, facsimile, homograph,
   homonym, homophone, idem, identical same, imitation, knockoff,
   likeness, mock-up, model, no other, none other, paraphrase, parody,
   photocopy, quadruplicate, repetition, replication, representation,
   reproduction, selfsame, spit and image, spitting image, synonym,
   the same, the same difference, travesty, triplicate, twin, version,
   very image, very same



The Devil's Dictionary (1881-1906):

REPLICA, n.  A reproduction of a work of art, by the artist that made
the original.  It is so called to distinguish it from a "copy," which
is made by another artist.  When the two are mae with equal skill the
replica is the more valuable, for it is supposed to be more beautiful
than it looks.