Arbiter
/ˈɑːbɪtə(ɹ)/
noun
A person appointed, or chosen, by parties to determine a controversy between them; an arbitrator.
(with of) A person or object having the power of judging and determining, or ordaining, without control; one whose power of deciding and governing is not limited.
“Television and film, not Vogue and similar magazines, are the arbiters of fashion.”
A component in circuitry that allocates scarce resources.
verb
To act as arbiter.