Definition - What does Certiorari mean?
Certiorari is a Latin term which means "to be more fully informed." In a legal sense, certiorari refers to an order from a superior court to have the records of a particular case fro a lower court be brought to the superior court for examination. When a superior court makes such an order, it is known as a writ of certiorari.
Justipedia explains Certiorari
Certiorari is basically the name for the process by which a superior court chooses cases from a lesser court to review. Certiorari is frequently used by the United States Supreme Court to select cases it wishes to take further interest in. If a party wishes to have its case looked at by a higher court, then they can petition for a writ of certiorari. In this circumstance, the higher court will either grant "cert" or deny it.