- arbiter, supreme authority - someone with the power to settle matters at will; "she was the final arbiter on all matters of fashion"
--1 is a kind of expert
- arbiter, arbitrator - someone chosen to judge and decide a disputed issue
--2 is a kind of mediator, go-between, intermediator, intermediary, intercessor
--2 has particulars: third partyDerived form: verb arbitrate1