一切經音義 9.284

9.284

八由行（又作遊行又作道行或作直行或言八直道亦言八聖道或言正道其義一也）。

八由行 [eightfold path]: Also written 遊行 (wandering/path), also written 道行 (traveling the path), or written 直行 (straight path); or called the Eightfold Straight Path, also called the Eightfold Noble Path, or called the Right Path. Their meanings are one and the same.