Source : Webster's Revised Unabridged Dictionary (1913)

Imitate \Im"i*tate\, v. t. [imp. & p. p. {Imitated}; p. pr. &
   vb. n. {Imitating}.] [L. imitatus, p. p. of imitari to
   imitate; of unknown origin. Cf. {Image}.]
   1. To follow as a pattern, model, or example; to copy or
      strive to copy, in acts, manners etc.

            Despise wealth and imitate a dog.     --Cowlay.

   2. To produce a semblance or likeness of, in form, character,
      color, qualities, conduct, manners, and the like; to
      counterfeit; to copy.

            A place picked out by choice of best alive The
            Nature's work by art can imitate.     --Spenser.

            This hand appeared a shining sword to weild, And
            that sustained an imitated shield.    --Dryden.

   3. (Biol.) To resemble (another species of animal, or a
      plant, or inanimate object) in form, color, ornamentation,
      or instinctive habits, so as to derive an advantage
      thereby; sa, when a harmless snake imitates a venomous one
      in color and manner, or when an odorless insect imitates,
      in color, one having secretion offensive to birds.

Source : WordNet®

imitate
     v 1: reproduce someone's behavior or looks; "The mime imitated
          the passers-by"; "Children often copy their parents or
          older siblings" [syn: {copy}, {simulate}]
     2: appear like, as in behavior or appearance; "Life imitate
        art"
     3: make a reproduction or copy of