This article examines the anxiety expressed by von Wright over the status of the deontic permission, P, as an independent normative category, given the interdefinability between P and O at the foundation of deontic logic. Two concerns are noted: the reducibility of P to O, and the inadequacy of P to convey a full permission in a social setting. Drawing on resources from the Hohfeldian analytical framework, the relational and aggregate features of permission are explored, and an aggregate conception of permission, P, is recognized. With the assistance of insights from Demey and Smessaert on duals, Hansson on formalization, and Soames on interdefinability, it is concluded that the interdefinability thesis can be defended without threatening the independent status of P. Additional grounds for reaching this conclusion are provided from a detailed analysis of the relationship between P and P. Some implications of the more expansive notion of permission, P, are considered with regard to the resources of deontic logic and their application.