IPA: /ˈdɪpləˌmætɪst/
KK: /ˈdɪpləˌmætɪst/
A person who represents their country in foreign affairs and helps manage relationships between nations.
The diplomatist worked tirelessly to negotiate a peace treaty between the two countries.
Diplomatist → It is formed from "diploma" (from Greek "diplōma", meaning a folded paper or document) and "-ist" (meaning a person who practices or is concerned with). The word "diplomatist" refers to a person who is skilled in diplomacy, often dealing with international relations and negotiations.
Think of a 'diploma' as a formal document, and remember that a 'diplomatist' is someone who handles formal negotiations and relations.