arbiter

[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

superarbiter, noun
Dictionary.com Unabridged

arbiter elegantiae

[ahr-bi-ter ey-le-gahn-tee-ahy; English ahr-bi-ter el-uh-gan-shee-ee]
noun Latin.
a judge of elegance or matters of taste.
Also, arbiter elegantiarum [ahr-bi-ter ey-le-gahn-tee-ah-room; English ahr-bi-ter el-uh-gan-shee-air-uhm] .
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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
This person sees himself or herself as the final arbiter of all things moral
  and ethical at the college.
Elections are the arbiter of disputes in free societies.
You are not the arbiter of what other people should do.
Surely, the bank's policymaking board would have been the better arbiter.
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