an accredited diplomat sent by a country as its official representative to a foreign country.
“the French ambassador to Portugal”
synonyms: envoy, plenipotentiary, emissary, (papal) nuncio, representative, high commissioner, consul, consul general, diplomat; archaiclegate
“the American ambassador”
a person who acts as a representative or promoter of a specified activity.
“he is a good ambassador for the industry”
synonyms: campaigner, representative, promoter, champion, supporter, backer, booster
“a great ambassador for the sport”