arbiter

UK: /ˈɑː^rbɪtə^r/ US: /ˈɑrbɪtɚ/ ,(är′bi tər)

WordReference Random House Learner's Dictionary of American English © 2026

ar•bi•ter /ˈɑrbɪtɚ/   n. [countable]

1. a person given the power to decide matters at issue;
   judge;
   umpire.

WordReference Random House Unabridged Dictionary of American English © 2026

ar•bi•ter  (är′bi tər), n. 

1. a person empowered to decide matters at issue;
   judge;
   umpire.
2. a person who has the sole or absolute power of judging or determining.

• Latin arbiter
• Anglo-French, Old French
• Middle English arbitour, arbitre 1350–1400

Collins Concise English Dictionary © HarperCollins Publishers::

arbiter / ˈɑːbɪtə/ noun

1. a person empowered to judge in a dispute; referee; arbitrator
2. a person having complete control of something

Etymology: 15th Century: from Latin, of obscure origin