(1) An allocation of space, within a container of a table space, to a single database object. This allocation consists of multiple pages.
(2) A continuous space on a disk, direct-access storage volume, or diskette that is occupied by or reserved for a particular data set, data space, or file.
(3) A unit of data that manages the mapping of data between managed discs (MDisks) and virtual discs (VDisks). See also multiple allegiance.