Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Language: Latin
Origin: arbitrarius 'depending on the decision of a judge, uncertain', from arbiter; ARBITER

arbitrary

adjective
     
ar‧bi‧tra‧ry
decided or arranged without any reason or plan, often unfairly:
the arbitrary arrests of political opponents
arbitrariness noun [uncountable]
arbitrarily adverb:

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