1. A diplomatic official of the highest rank appointed and accredited as representative in residence by one government or sovereign to another, usually for a specific length of time. 2. A diplomatic official heading his or her country's permanent mission to certain international organizations, such as the United Nations. 3. An authorized messenger or representative. 4. An unofficial representative: ambassadors of goodwill.
ETYMOLOGY:
Middle English ambassadour, from Old French ambassadeur, from Medieval Latin ambactia, mission, from Latin ambactus, servant, ultimately of Celtic origin. See ag- in Appendix I.
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