(1) In IDDU, an object for storing field, record format, and file definitions. The system-recognized identifier for the object type is *DTADCT.
(2) A repository of information about an organization's application programs, databases, logical data models, users, and authorizations.
(3) A grouping of logically related components of a particular syntax type, such as ROD dictionaries, EDI dictionaries, and XML dictionaries.