ukase Syllabification: (u·kase)Pronunciation: /yo͞oˈkās, -ˈkāz/Definition of ukase noun an edict of the Russian government:Tsar Alexander I issued his famous ukase unilaterally decreeing the North Pacific Coast Russian territory an arbitrary command:defying the publisher in the very building from which he had issued his ukaseOrigin:from Russian ukaz 'ordinance, edict', from ukazatʹ 'to show, decree'ukase in other Oxford dictionaries Definition of ukase in the British & World English dictionary