due process of law

Definition from Nolo’s Plain-English Law Dictionary

A fundamental principle of fairness in all legal matters, both civil and criminal, especially in the courts. All legal procedures set by statute and court practice, including notice of rights, must be followed for each individual so that no prejudicial or unequal treatment will result. While somewhat indefinite, the term can be gauged by its aim to safeguard both private and public rights against unfairness.

Definition provided by Nolo’s Plain-English Law Dictionary.