<operating system> 1. (Or "uid", "user id") A number or name which is unique to a particular user of a computer or group of computers which share user information. The operating system uses the uid to represent the user in its data structures, e.g. the owner of a file or process, the person attempting to access a system resource etc.
A user database, e.g. Unix's /etc/passwd file or NIS, maps the uid to other information about that user such as their user name, password, home directory and real name.
2. user name.
Try this search on Wikipedia, OneLook, Google
Nearby terms: User Datagram Protocol « user-friendly « user id « user identifier » user interface » user interface copyright » User Interface Language