A user's default group. The file system uses the ID of the primary group when a user accesses a file he or she doesn't own.

a feature for Macintosh clients and users running POSIX compliant applications

a fellowship whose members share experiences, confide in one another, and have mutual feelings and understandings

an intimate face-to-face relationship with "Significant Others" (i

a typically small social group whose members share close, personal, enduring primary relationships

In a primary group, members have an emotional bond to one another such that the individual's place in that group can never be filled by another person.

Charles Horton Cooley's term for a small, less specialized group in which members engage in face-to-face, emotion-based interactions over an extended period of time.