This document defines terms used in the field of the assessment of the release, and the content, of dangerous substances from/in construction products. The terms are classified under the following main headings: Terms related to products and substances (general; soil, groundwater and Surface water; indoor air); Terms related to sampling and sample preparation; Terms related to test procedures and test results (general; soil, groundwater and surface water; indoor air, radiation). An alphabetical index is provided. NOTE Further terms generally concerning the development and application of technical specifications for construction products which fall under the scope of the construction products regulation (CPR) are listed in Annex A; their definitions are given in a Glossary by the European Commission, DG Enterprise and Industry (2014).