noun (n)

• imitating the mannerisms of another person(noun.act)

  Synonym:
  impersonation
  

  source: wordnet30
• acting the part of a character on stage; dramatically representing the character by speech and action and gesture(noun.act)

  Synonym:
  characterization, enactment, portrayal
  

  source: wordnet30
• The act of personating, or conterfeiting the person or character of another.(noun)

  source: webster1913