ambassador

noun4

1. •
   a top official that one country sends to another to speak and act for its government

   • Vergenne'fury reached its height when the priest tried to involve the English ambassador. — 1982
2. •
   An official messenger and representative.
3. •
   A corporate representative, often the public face of the company.

   • As front hall porter, you are an ambassador for the hotel.
4. •
   A player who is an excellent role-model and who upholds the integrity of the game and thereby contributes to the sport's popularity and growth.