As a sub-structural scientific branch, terminology is common in all the sciences and is in charge of identifying and defining the technical terms of sciences in a systematic form. Like other sciences, interpretation has its own terms and vocabulary, whose definition is the most necessary step before utilizing them. Meanwhile, the term “principles of interpretation” has for some time been brought up in the Islamic sciences and particularly interpretation, and the interpreters and Qur’ān researchers have given various definitions for it from different perspectives. The present writing is intended to give a comprehensive and conclusive definition for this term through studying its previous definitions.