(noun) “A group a person belongs to and feels is an integral part of his or her identity” (OpenStax College 2012).

Example: The home team (opposed to the visiting team or out-group) including their fans during a a game of football.

Audio Pronunciation: (in-group)

Download Audio Pronunciation: in-group.mp3

Usage Notes:

Related Quotations:

  • “Empirical evidence suggests that a predisposition to favor in-groups can be easily triggered by even arbitrary group distinctions and that preferential cooperation within groups occurs even when it is individually costly” (Hammond and Axelrod 2006).
  • “Ethnocentrism is a nearly universal syndrome of attitudes and behaviors, typically including in-group favoritism” (Hammond and Axelrod 2006:926).

Additional Information:

Related Terms: 



Hammond, Ross A., and Robert Axelrod. 2006. “The Evolution of Ethnocentrism.” The Journal of Conflict Resolution : A Quarterly for Research Related to War and Peace50(6): 926-936.

OpenStax College. 2012. Types of Groups. Connexions, June 13, 2012. (