A description of a particular category or response. OECD Glossary of Statistical Terms: Generic term for items at any level within a classification, typically tabulation categories, sections, subsections, divisions, subdivisions, groups, subgroups, classes and subclasses. In addition to the standard name, label, and description, a category may contain a reference to a defining concept, provide information on how the category was generated (membership defined), and indicate if it is the description of a type of missing value.