Formal notice by the prosecutor that prosecution in a criminal case will be ended as to one or more counts, one or more defendants, or altogether.
Similar notice by the plaintiff in a civil suit.
A declaration that the plaintiff in a civil case or the prosecutor in a criminal case will drop prosecution of all or part of a suit or indictment.
Origin of nolle-prosequi
Latin nōlle prōsequī to be unwilling to pursue nōlle to be unwilling prōsequī to pursue