diplomat

Etymology

From French diplomate, a back-formation from diplomatique (“diplomatic”), ultimately from Ancient Greek δίπλωμα (díplōma, “double-folded document”).

noun

1. A person, such as an ambassador, who is accredited to represent a government officially in its relations with other governments or international organisations
   In a meeting with a top Chinese diplomat last year, Moon said China was partly responsible for South Korea’s pollution problem. Audio (US) (file) 2019, VOA Learning English (public domain)
2. (figurative) Someone who uses skill and tact in dealing with other people