"primary group" is correct and usable in written English.
You can use the phrase to refer to a group of people who are closely connected and interact frequently, such as family members or close friends. For example: "My primary group consists of my parents, siblings, and best friends."
Its four underwriting groups include GEICO, General Re Corp., Berkshire Hathaway Reinsurance Group and Berkshire Hathaway Primary Group.
The soldier's primary group consists of his comrades in the squad or platoon or gun crew.
Capsizing of ships constitutes a primary group of casualties that leads to loss of life and money.
A social movement lacks both the intimacy of a primary group and the formal boundaries of an association.
The deal also gives Digital City a minority stake in The Primary Group, a creator of online advertising that had been part of WP Studio.
But in the narrower audience segment of viewers between the ages of 18 and 49, the primary group advertisers seek in late night, Mr. Leno's edge was even smaller Thursday.
Birds also have been the primary group in the study of migration and orientation and the effect of hormones on behaviour and physiology.
Through extensive analysis, the authors demonstrate that when the Democratic and Republican parties fail to raise political awareness, to engage deeply held political convictions, or to affirm primary group attachments, nonpartisanship becomes a rationally adaptive response.
The worship of ancestors must be understood as a family institution in which intercourse between the living and the dead is the internal activity of a social primary group.
Although individuals within a primary group generally are aware of their cultural bonds, the various groups within an ethnographically determined culture area do not necessarily share any self-recognition of their affinities to one another.
When asked about Ms. Banerjee's impending decision, Renuka Chowdhury, a spokesman for the Congress Party, the primary group in the governing coalition, said: "We remain optimistic, while we appreciate her limitations and compulsions".
