in-group

or in·group

[ in-groop ]
See synonyms for in-group on Thesaurus.com
nounSociology.
  1. a group of people sharing similar interests and attitudes, producing feelings of solidarity, community, and exclusivity.: Compare out-group.

Origin of in-group

1
First recorded in 1905–10; in-1 + group

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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

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012