This document provides a compendium of all terms which been agreed for use in standards from the CEN-CLC standards, in the numerical range of 45552-45559. Such terms are intended to be used in other standards about material efficiency, developed based on CEN-CLC standards, in the numerical range of 45552-45559, or intended to complement that series. They also constitute the basis for development of new definitions used in product-specific material efficiency standards.