I. noun 1. an accredited diplomat sent by a state as its permanent representative in a foreign country • the French ambassador to Portugal.
2. a representative or promoter of a specified activity • he is a good ambassador for the industry.
II. derivatives 1. ambassadorial /ambasəˈdɔːriəl / adjective
2. ambassadorship /amˈbasədəʃɪp / noun
– origin late Middle English: from French ambassadeur, from Italian ambasciator, based on Latin ambactus ‘servant’.