primary group

Definition of primary group in The Network Encyclopedia.

What is Primary Group (in computer networking)?

In Microsoft Windows NT, the global group that is specified as primary for a particular user account. Users can be members of many different global groups within their domain, but only one of these global groups can be the primary group.

Primary groups are used when users running Windows NT Services for Macintosh or POSIX applications log on to the computer. The user’s primary group is the group that the owner of a particular resource works with most.