arbitrary
/ˈɑːbɪtrərɪ/adjective
1- based on random choice or personal whim, rather than any reason or system随机选择的, 随心所欲的, 无理由的, 无系统的：
his mealtimes were entirely arbitrary.
他吃饭完全不定时。
1.1
- (of power or a ruling body) unrestrained and autocratic in the use of authority（权力, 统治机构）专断的, 专制的：
a country under arbitrary government.
一个受专制政府管理的国家。
1.2
- Mathematics (of a constant or other quantity) of unspecified value【数】（常数, 量）任意的。
派生词
arbitrarily
adverbarbitrariness
noun词源
late Middle English （in the sense 'dependent on one's will or pleasure， discretionary'）： from Latin arbitrarius, from arbiter 'judge， supreme ruler'， perhaps influenced by French arbitraire.