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English definition of “arbitrary”

arbitrary

adjective (CHANCE)    /ˈɑː.bɪ.trər.i/ US  /ˈɑːr.bə.trer-/
C2 based on chance rather than being planned or based on reason: arbitrary decision-making Did you have a reason for choosing your destination or was it arbitrary?Chance and randomness arbitrarily     /ˌɑː.bɪˈtreə.rɪ.li/ US  /ˌɑːr.bɪˈtrer.ɪ-/ adverb We made the decision to go to Italy quite arbitrarily.Chance and randomness arbitrariness   /-nəs/ noun [U] Chance and randomness
(Definition of arbitrary adjective (CHANCE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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