ukase

noun2

1. •
   An authoritative proclamation; an edict, especially decreed by a Russian czar or later ruler.

   • Many estates peopled with crown peasants have been, according to an ukase of Peter the Great, ceded to particular individuals on condition of establishing manufactories […] — 1844
2. •
   (figurative) Any absolutist order or arrogant proclamation

   • I knew a stunned plunge of disappointment and a bitter anger. What right had he to issue such an arbitrary ukase? — 1965