Definition of Final decision rule
Appeals to federal courts of appeals from U.S. district courts must be from "final decisions” of district courts. 28 U.S.C.A. § 1291. In other words, the courts of appeals lack jurisdiction over nonfinal judgments. The object of this restriction is to prevent piecemeal litigation which would otherwise result from the use of interlocutory appeals. See Interlocutory Appeals Act
That's the definition of Final decision rule in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.