noun (n)

• a diplomat having less authority than an ambassador(noun.person)

  Synonym:
  envoy extraordinary, minister plenipotentiary
  

  source: wordnet30
• someone sent on a mission to represent the interests of someone else(noun.person)

  Synonym:
  emissary
  

  source: wordnet30
• a brief stanza concluding certain forms of poetry(noun.communication)

  Synonym:
  envoi
  

  source: wordnet30
• One dispatched upon an errand or mission; a messenger; esp., a person deputed by a sovereign or a government to negotiate a treaty, or transact other business, with a foreign sovereign or government; a minister accredited to a foreign government. An envoy's rank is below that of an ambassador.(noun)

  source: webster1913