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From The Collaborative International Dictionary of English v.0.48:
Ukase \U*kase"\, n. [F., fr. Russ. ukas'; pref. u- + kazate to show, to say.] 1. In Russia, a published proclamation or imperial order, having the force of law. [1913 Webster] 2. an order or edict by someone holding absolute authority. [PJC]