arbitrary

[ahr-bi-trer-ee]
adjective
1.
subject to individual will or judgment without restriction; contingent solely upon one's discretion: an arbitrary decision.
2.
decided by a judge or arbiter rather than by a law or statute.
3.
having unlimited power; uncontrolled or unrestricted by law; despotic; tyrannical: an arbitrary government.
4.
capricious; unreasonable; unsupported: an arbitrary demand for payment.
5.
Mathematics. undetermined; not assigned a specific value: an arbitrary constant.
noun, plural arbitraries.
6.
arbitraries, Printing. (in Britain) peculiar ( def 9 ).

Origin:
1400–50; late Middle English < Latin arbitrārius uncertain (i.e., depending on an arbiter's decision). See arbiter, -ary

arbitrarily [ahr-bi-trer-uh-lee, ahr-bi-trair-] , adverb
arbitrariness, noun
nonarbitrarily, adverb
nonarbitrariness, noun
nonarbitrary, adjective
unarbitrarily, adverb
unarbitrary, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
arbitrary (ˈɑːbɪtrərɪ)
 
adj
1.  founded on or subject to personal whims, prejudices, etc; capricious
2.  having only relative application or relevance; not absolute
3.  (of a government, ruler, etc) despotic or dictatorial
4.  maths not representing any specific value: an arbitrary constant
5.  law (esp of a penalty or punishment) not laid down by statute; within the court's discretion
 
[C15: from Latin arbitrārius arranged through arbitration, uncertain]
 
'arbitrarily
 
adv
 
'arbitrariness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

arbitrary
early 15c., "deciding by one's own discretion," from L. arbitrarius "depending on the will, uncertain," from arbiter (see arbiter). The original meaning gradually descended to "capricious" and "despotic" (1640s).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Characters and events are invented or arbitrarily altered to suit the adapter's
  purpose.
Ministers were arbitrarily sacked, and fearsomely scolded.
Though arbitrarily enforced, you can only bring home one liter of wine
  duty-free.
In principle, the refrigerator can chill arbitrarily close to absolute zero.
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