Ratio Decidendi
Literal meaning: “The reason for deciding.”
What does the Latin term "Ratio Decidendi" mean in law?
Ratio decidendi is the legal principle or reasoning that forms the binding part of a judicial decision. It is the rule of law upon which the court's holding is based and which subsequent courts are obligated to follow under stare decisis. Identifying the ratio decidendi of a case requires careful analysis of the facts the court considered material and the legal reasoning it applied to those facts. Everything in a judicial opinion that is not ratio decidendi is obiter dictum — statements made in passing that, while potentially persuasive, are not binding precedent.
Source: General · Legal Latin
Legal Definition
Ratio decidendi is the legal principle or reasoning that forms the binding part of a judicial decision. It is the rule of law upon which the court's holding is based and which subsequent courts are obligated to follow under stare decisis. Identifying the ratio decidendi of a case requires careful analysis of the facts the court considered material and the legal reasoning it applied to those facts. Everything in a judicial opinion that is not ratio decidendi is obiter dictum — statements made in passing that, while potentially persuasive, are not binding precedent.
How It's Used
Ratio decidendi is essential to case analysis and legal reasoning. Law students must learn to distinguish the ratio (binding rule) from obiter dicta (non-binding observations) when briefing cases. It is a central concept in jurisprudence and common-law methodology.
Example Sentences
The ratio decidendi of Marbury v. Madison is that the Supreme Court has the power of judicial review over acts of Congress.
Students must carefully identify the ratio decidendi of each case to understand what principle of law the court actually established.
The lower court was bound by the ratio decidendi of the appellate decision, not by the dicta that accompanied it.