arbitrary

• adj.[数]恣意的な、独断的な、専制的な

arbiter、仲裁、審判、-ary、形容詞接尾辞。語源的には蔑称。

arbitrary

arbitrary: [15] Arbitrary comes ultimately from Latin arbiter ‘judge’, via the derived adjective arbitrārius. It originally meant ‘decided by one’s own discretion or judgment’, and has since broadened, and ‘worsened’, in meaning to ‘capricious’. The Latin noun has of course contributed a large number of other words to English, including arbiter [15] itself, arbitrate [16] (via the Latin verb arbitrārī), and arbitrament [14]. Arbitrage in the sense ‘buying and selling shares to make a profit’ is a 19thcentury borrowing from French, where it means literally ‘arbitration’.
=> arbitrate

arbitrary (adj.)

early 15c., "deciding by one's own discretion," from Old French arbitraire (14c.) or directly from Latin arbitrarius "depending on the will, uncertain," from arbiter (see arbiter). The original meaning gradually descended to "capricious" and "despotic" (1640s). Related: Arbitrarily; arbitrariness.

1. The choice of players for the team seemed completely arbitrary .

このチームのメンバーは完全にランダムに選ばれているようだ。

2.A good judge does not make arbitrary decisions.

優れた裁判官は独断的な判決を下すことはありません。

3.You can make an arbitrary choice.

好きなように選べます。

4.He makes unpredictable， arbitrary decisions.

彼のした決定は予想できず、主観的に独断した。

5. Arbitrary arrests and detention without trial were common.

任意逮捕や拘留は珍しくない。