Meaning of ARBITRARY in English
[adjective] - based on chance rather than being planned or based on reason, or (disapproving) based on personal power without considering people's wishesShe made an arbitrary choice of the black shoes instead of the brown ones.Our decision to go to Italy this summer rather than Spain was quite arbitrary.(disapproving) an arbitrary ruler (= ruling by uncontrolled personal power, not because others wish him or her to do so.)(disapproving) The company has been the subject of an arbitrary take-over (= control has been taken of it without considering its wishes).
Cambridge English vocab. Кембриджский английский словарь. 2012