(in czarist Russia) an edict or order of the czar having the force of law.
2.
any order or proclamation by an absolute or arbitrary authority.
Origin: 1720–30; < French < Russian ukáz,Old Russian ukazŭ, noun derivative of ukazati to show, indicate, assign, command, equivalent to u- prefix + kazati to show, order
1729, "decree issued by a Russian emperor," from Rus. ukaz "edict," from ukazat' "to show, decree," from O.C.S. ukazati, from u-, intens. prefix, + kazati "to show, order," which is related to the first element of Casimir.