in-group

[in-groop] /ˈɪnˌgrup/
noun
1.
a narrow exclusive group; clique.
2.
Sociology. a group of people sharing similar interests and attitudes, producing feelings of solidarity, community, and exclusivity.
Compare out-group.
Also, ingroup.
Origin
1905-10; in-1 + group
British Dictionary definitions for in-group

in-group

noun
1.
(sociol) a highly cohesive and relatively closed social group characterized by the preferential treatment reserved for its members and the strength of loyalty between them Compare out-group
Slang definitions & phrases for in-group

in-group

noun phrase

An exclusive group or clique, esp of influential persons (1907+)