What is Judicial Review?

Legal Definition
Judicial review is the idea, fundamental to the US system of government, that the actions of the executive and legislative branches of government are subject to review and possible invalidation by the judicial branch. Judicial review allows the Supreme Court to take an active role in ensuring that the other branches of government abide by the constitution. Judicial review was established in the classic case of Marbury v. Madison, 5 US 137 (1803).
Legal Definition
1. One court’s review of another court’s proceedings and judgments). Typically, a higher court review of a lower court. Can also be a review of an administrative body’s factual or legal findings. The reviewing court can even award damages as well as uphold or reverse any order reviewed. 2. Supreme Court authority to decide constitutionality of a law. Until the constitution itself is amended to accommodate them, all unconstitutional laws are de facto null and void.