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arbitrary

audio pronunciation audio pronunciation
adjective
  • based on personal opinion or impulse, not on reason [Barron]
noun
  • unreasonable or capricious; random; tyrannical; Ex. arbitrary ruler [Nandigam]

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WordNet:
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Merriam-Webster Online:
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MSN Encarta:
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American Heritage Dictionary of the English Language:
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Answers.com:
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