fiat
/ˈfaɪæt/noun
1- a formal authorization or proposition; a decree授权; 批准, 许可; 命令, 法令：
the reforms left most prices fixed by government fiat.
改革把大部分价格交由政府法令确定。
1.1
- an arbitrary order武断的命令。
词源
late Middle English: from Latin, 'let it be done', from fieri 'be done or made'.