Definition of arbitrary adjective from the Oxford Advanced American Dictionary

      

    arbitrary

     adjective
    adjective
    NAmE//ˈɑrbəˌtrɛri//
     
     
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  1. 1(of an action, a decision, a rule, etc.) not seeming to be based on a reason, system, or plan and sometimes seeming unfair The choice of players for the team seemed completely arbitrary. He makes unpredictable, arbitrary decisions.
  2. 2(formal) using power without restriction and without considering other people the arbitrary powers of officials
NAmE//ˌɑrbəˈtrɛrəli//
 
adverb The leaders of the groups were chosen arbitrarily. The political frontiers in Africa were often arbitrarily drawn up by the old colonial powers.
 arbitrariness
 
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NAmE//ˈɑrbəˌtrɛrinəs//
 
noun [uncountable] Court officials were suspected of arbitrariness and personal bias.
See the Oxford Advanced Learner's Dictionary entry: arbitrary