A prior decision by a court that must be followed without a compelling reason or significantly different facts or issues. Courts are often bound by the decisions of appellate courts with authority to review their decisions. For example, district courts are bound by the decisions of the court of appeals that can review their cases, and all courts – both state and federal– are bound by the decisions of the Supreme Court of the United States. (https://www.justice.gov/usao/justice-101/glossary)