1.1 This terminology2 consists of terms and definitions pertaining to sustainability. 1.2 The purpose of this terminology is to provide meanings and explanations of terms applicable to sustainability. In the interest of common understanding and standardization, consistent word usage is encouraged to help eliminate the major barrier to effective technical communication. 1.3 It is recommended that terms used only within an individual standard, and having a meaning unique to that standard, be defined or explained in the terminology section of that individual standard. 1.4 Certain standard definitions herein are adopted from other sources. Each is an exact copy. The source is identified at the right margin following the definition and is listed in Section 2. 1.5 Terms are listed in alphabetical sequence. Compound terms appear in the natural spoken order. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.