1.1 This terminology is a compilation of definitions and descriptions of technical terms used in dynamic mechanical property measurements on polymeric materials, including solutions, melts, and solids. Terms that are generally understood or defined adequately in other readily available sources are either not included or sources identified. 1.2 A definition is a single sentence with additional information included in notes. It is reviewed every five years and the year of the last review or revision is appended. 1.3 Definitions identical to those published by another standards organization or ASTM committee are identified with the abbreviation of the name of the organization or the ASTM committee. 1.4 Descriptions of terms specific to dynamic mechanical measurements are identified with an italicized introductory phrase. This terminology standard is similar to ISO 6721-1 however, the ISO document cites fewer terms.