The Collaborative International Dictionary of English v.0.48:

Mimicry \Mim"ic*ry\, n.
   1. The act or practice of one who mimics; ludicrous imitation
      for sport or ridicule.
      [1913 Webster]

   2. (Biol.) Protective resemblance; the resemblance which
      certain animals and plants exhibit to other animals and
      plants or to the natural objects among which they live, --
      a characteristic which serves as their chief means of
      protection against enemies; imitation; mimesis; mimetism.
      [1913 Webster]

WordNet (r) 3.0 (2006):

mimicry
    n 1: the act of mimicking; imitative behavior [syn: apery,
         mimicry]
    2: the resemblance of an animal species to another species or to
       natural objects; provides concealment and protection from
       predators