WordReference Random House Learner's Dictionary of American English © 2015
am•bas•sa•dor /æmˈbæsədɚ, -ˌdɔr/USA pronunciation
- Governmenta diplomatic official of the highest rank, sent by one country to live in another as its representative.
- Governmentan unofficial representative:a good-will ambassador.
Collins Concise English Dictionary © HarperCollins Publishers::
ambassador /æmˈbæsədə/ n
Etymology: 14th Century: from Old French ambassadeur, from Italian ambasciator, from Old Provençal ambaisador, from ambaisa (unattested) mission, errand; see embassyamˈbassadress fem n ambassadorial /æmˌbæsəˈdɔːrɪəl/ adj amˈbassadorˌship n
- short for ambassador extraordinary and plenipotentiary; a diplomatic minister of the highest rank, accredited as permanent representative to another country or sovereign
- ambassador extraordinary ⇒ a diplomatic minister of the highest rank sent on a special mission
- ambassador plenipotentiary ⇒ a diplomatic minister of the first rank with treaty-signing powers
- ambassador-at-large ⇒ US an ambassador with special duties who may be sent to more than one government
- an authorized representative or messenger