This document provides definitions of terms used in the European Paper Industry statistics reports, in particular CEPI's Annual and Key Statistics as well as its Sustainability Reports. It is for the use of both providers and users of European paper industry statistics. It is divided into nine sections covering all aspects of the industry, from its structure to the raw materials used and grades of paper produced. It also covers terms used for environmental, energy and social statistics. More information and details related to the definitions reported in this document can be found in additional annexes, listed on page 47.