Definition of in-group in English:

in-group

Syllabification: in-group

noun

An exclusive, typically small, group of people with a shared interest or identity.
More example sentences
  • This heightened awareness becomes personally relevant when one commits to identifying with the ethnic in-group.
  • I think there's another side to it as well, seen from the other side of the fence: incoming slang is a sort of secret language, expressing exquisitely shaded meanings that are shared among the in-group but are baffling to outsiders.
  • Such dialects, almost by definition, are media of intimacy: ‘mother tongues’ used in the family and in-groups.
Synonyms
inner circle, in-crowd, popular crowd, clique, set, circle, coterie
informal gang, bunch, crew

Definition of in-group in:

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