Source : Webster's Revised Unabridged Dictionary (1913)

Mimesis \Mi*me"sis\, n. [NL., fr. Gr. ? imitation.] (Rhet. &
   Biol.)
   Imitation; mimicry.

Source : WordNet®

mimesis
     n 1: the imitative representation of nature and human behavior in
          art and literature
     2: any disease that shows symptoms characteristic of another
        disease
     3: the representation of another person's words in a speech