IPA: /ˈdɪpləˌmeɪt/
KK: /ˈdɪpləˌmeɪt/
A person who has received a diploma, particularly in the medical field, and is certified as a specialist by a board of examiners.
After years of study and training, she became a diplomate in her medical specialty.
Diplomate → It is derived from the French word 'diplomate', which comes from 'diplôme' (meaning diploma or official document) and the suffix '-ate' (indicating a person who performs an action). A diplomate is a person who holds a diploma or is involved in diplomatic activities.
Think of someone who holds an official document ('diplôme') and is engaged in diplomatic work — that's what a diplomate is.