data related to a property of a phenomenon, body, or substance, or to a system of components of known composition or structure, obtained from an identified source, critically evaluated, and verified for accuracy
EXAMPLE Reference data for solubility of chemical compounds as published by the IUPAC.
NOTE 1 In this definition, 'accuracy' covers, for example, measurement accuracy and 'accuracy of a nominal property value'.
NOTE 2 “Data” is a plural form, “datum” is the singular. “Data” is commonly used in the singular sense, instead of “datum”.