noun (n)

• someone authorized to exercise the powers of sheriff in emergencies(noun.person)

  Synonym:
  deputy sheriff
  

  source: wordnet30
• an assistant with power to act when his superior is absent(noun.person)

  Synonym:
  lieutenant
  

  source: wordnet30
• a member of the lower chamber of a legislative assembly (such as in France)(noun.person)

  source: wordnet30
• a person appointed to represent or act on behalf of others(noun.person)

  Synonym:
  surrogate
  

  source: wordnet30
• One appointed as the substitute of another, and empowered to act for him, in his name or his behalf; a substitute in office; a lieutenant; a representative; a delegate; a vicegerent; as, the deputy of a prince, of a sheriff, of a township, etc.(noun)

  source: webster1913