arbiter
🇺🇸
/ˈɑːrbɪtər/
🇬🇧
/ˈɑːbɪtə(r)/
A person who makes decisions or judgments about what is best or most appropriate.
The teacher acted as an arbiter to resolve the students' argument.
老師擔當仲裁者來解決學生的爭論。