UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈɑːrbɪtrərinəs/

WordReference Random House Learner's Dictionary of American English © 2020
ar•bi•trar•y /ˈɑrbɪˌtrɛri/USA pronunciation   adj. 
  1. decided on or done by personal discretion, rather than by reason:an arbitrary decision.
  2. Governmenthaving unlimited power; despotic: an arbitrary government.
  3. capricious;
    unsupported: an arbitrary demand for obedience.
ar•bi•trar•i•ly /ˌɑrbɪˈtrɛrəli/USA pronunciation  adv. 
ar•bi•trar•i•ness, n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2020
ar•bi•trar•y  (ärbi trer′ē),USA pronunciation adj., n., pl.  -trar•ies. 
  1. subject to individual will or judgment without restriction; contingent solely upon one's discretion:an arbitrary decision.
  2. decided by a judge or arbiter rather than by a law or statute.
  3. Governmenthaving unlimited power;
    uncontrolled or unrestricted by law;
    tyrannical:an arbitrary government.
  4. capricious;
    unsupported:an arbitrary demand for payment.
  5. Mathematicsundetermined;
    not assigned a specific value:an arbitrary constant.

  1. Printingarbitraries,  Print. (in Britain) peculiar (def. 9).
ar•bi•trar•i•ly  (ärbi trer′ē),USA pronunciation adv.  arbi•trar′i•ness, n. 
  • Latin arbitrārius uncertain (i.e., depending on an arbiter's decision). See arbiter, -ary
  • late Middle English 1400–50

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