arbiter
nounUK /ˈɑː.bɪ.tər/
US /ˈɑːr.bɪ.tɚ/
A person who decides what is fair or right when others disagree.
The teacher acted as an arbiter when the two students argued over the game rules.
RELATED WORDS
OTHER MEANINGS
2. A person with the power to settle a dispute between two sides.
The union and the company asked an independent arbiter to settle their disagreement.
3. A person who has great influence over what is considered good or fashionable.
She was long regarded as an arbiter of taste in the fashion world.
4. Someone who has complete control over something.
The king was the final arbiter of justice in the kingdom.