The Collaborative International Dictionary of English v.0.48:

Imitative \Im"i*ta*tive\, a. [L. imitavitus: cf. F. imitatif.]
   1. Inclined to imitate, copy, or follow; imitating;
      exhibiting some of the qualities or characteristics of a
      pattern or model; dependent on example; not original; as,
      man is an imitative being; painting is an imitative art.
      [1913 Webster]

   2. Formed after a model, pattern, or original.
      [1913 Webster]

            This temple, less in form, with equal grace,
            Was imitative of the first in Thrace. --Dryden.
      [1913 Webster]

   3. (Nat. Hist.) Designed to imitate another species of
      animal, or a plant, or inanimate object, for some useful
      purpose, such as protection from enemies; having
      resemblance to something else; as, imitative colors;
      imitative habits; dendritic and mammillary forms of
      minerals are imitative. -- Im"i*ta*tive*ly, adv. --
      Im"i*ta*tive*ness, n.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Imitative \Im"i*ta*tive\, n. (Gram.)
   A verb expressive of imitation or resemblance. [R.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

imitative
    adj 1: marked by or given to imitation; "acting is an imitative
           art"; "man is an imitative being" [ant: nonimitative]
    2: (of words) formed in imitation of a natural sound;
       "onomatopoeic words are imitative of noises"; "it was
       independently developed in more than one place as an
       onomatopoetic term"- Harry Hoijer [syn: echoic,
       imitative, onomatopoeic, onomatopoeical,
       onomatopoetic] [ant: nonechoic]
    3: not genuine; imitating something superior; "counterfeit
       emotion"; "counterfeit money"; "counterfeit works of art"; "a
       counterfeit prince" [syn: counterfeit, imitative] [ant:
       echt, genuine]

Moby Thesaurus II by Grady Ward, 1.0:

45 Moby Thesaurus words for "imitative":
   apish, battological, delineatory, depictive, duplicative, echoic,
   echoing, embodying, emulative, figurative, graphic, ideographic,
   illustrational, illustrative, incarnating, iterative, limning,
   mimetic, mimic, mimish, onomatopoeic, onomatopoetic, parrotlike,
   personifying, pictographic, pictorial, portraying, recapitulative,
   redundant, reduplicative, reechoing, reiterant, reiterative,
   repeating, repetitional, repetitive, representational,
   representative, representing, simulative, symbolizing,
   tautological, tautologous, typifying, vivid