ar·bi·ter

[ahr-bi-ter]
noun
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.

Origin:
1350–1400; Middle English arbitour, arbitre < Anglo-French, Old French < Latin arbiter

su·per·ar·bi·ter, noun
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
arbiter (ˈɑːbɪtə)
 
n
1.  a person empowered to judge in a dispute; referee; arbitrator
2.  a person having complete control of something
 
[C15: from Latin, of obscure origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Arbiter is a GRE word you need to know.
So is stolid. Does it mean:
unexcitable
affected with, characterized by, or showing sadness; mournful; soberly thoughtful
Etymonline
Word Origin & History

arbiter
c.1500, from L. arbiter "one who goes somewhere (as witness or judge)," from ad- "to" + baetere "to come, go." The spec. sense of "one chosen by two disputing parties to decide the matter" is from 1540s. The earliest form of the word attested in English is the fem. noun arbitress (mid-14c.) "a woman
who settles disputes."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The medical arbiter's role is only to offer information about your impairment.
He is seen as an important arbiter and disciplinarian within the family.
The market, rather than the tax system, would then be the final arbiter as to
  how the economy's resources were allocated.
Ultimately, though, the arbiter of truth is reality.
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