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'''Certiorari''' is a writ of review issued by a higher court to a lower court. It is a means of getting an appellate court to review a lower court's decision. If an appellate court grants a writ of certiorari, it agrees to take the appeal. (Sometimes this' is referred to as "granting cert.") An application for '''certiorari''' is known as a "petition for cert", which is shorthand for a "Petition for a Writ of Certiorari." See also [[Writ of Certiorari]].
The votes of only four out of nine Justices, not a majority (five out of nine), are required by the [[U.S. Supreme Court]] to "grant cert." and thereby accept appeal of a case.