(1) The DB2 for z/OS system database that contains internal objects such as database descriptors and skeleton cursor tables.
(2) A type of file that contains the names and controlling information for objects or other directories.
(3) In a hierarchical file system, a grouping of related files and directories. A directory can contain zero or more entries, which refer to other directories and files.
(4) In OSI, a repository of information about objects. As defined in the X.500 directory standards, a directory is both a repository of information and the set of services provided to enable its users to access the information in the repository.
(5) A table of identifiers and references to the corresponding items of data.
(6) A collection of open systems that cooperate to hold a logical database of information about a set of objects in the real world.
(7) The part of a partitioned data set that describes the members in the data set.
(8) In UNIX, a file that maps the names of other directories and files to their locations.