Dictionary.net

the phonological or orthographic sound or appearance of a word that can be used to describe or identify something; "the inflected forms of a word can be represented by a stem and a list of inflections to be attached"

Terms or expressions which provide the major means of access by subject to the bibliographic unit.

An integer, string or other small datavalue which refers to one of several objects allocated to aprogram by the operating system, usually the kernel. Acommon example is a Unix file descriptor which is a smallinteger that identifies an I/O channel. Another example is areference to an area of memory (e.g. shared memory).Compare capability.