Functus officio, Latin for "having performed his office," is a legal term used to indicate that a public official, court, governing body, or statute retains no legal authority because his or its duties and functions have been completed. The term is most commonly used by a higher court as a justification for vacating or overruling all or part of a lower court's opinion. For example, if a United States federal court decides that a law comports with the requirements of due process, the court cannot then attempt to strike the law simply because the law is unwise becuase the court's due process determination renders it functus officio in the particular case. Latin is the language originally spoken in the region around Rome called Latium. ... A court is an official, public forum which a public power establishes by lawful authority to adjudicate disputes, and to dispense civil, labour, administrative and criminal justice under the law. ... A statute is a formal, written law of a country or state, written and enacted by its legislative authority, perhaps to then be ratified by the highest executive in the government, and finally published. ... The United States federal courts are the system of courts organized under the Constitution and laws of the federal government of the United States. ... Due process of law is a legal concept that ensures the government will respect all of a persons legal rights instead of just some or most of those legal rights, when the government deprives a person of life, liberty, or property. ...