Ingroup vs. Outgroup — What's the Difference?

(sociology) The social group that one belongs to.

A group of people excluded from or not belonging to one's own group, especially when viewed as subordinate or contemptibly different.

(systematics) In cladistics, the monophyletic group that includes all taxa of interest to the current study.

A group of organisms not part of the group under consideration, used for comparison when analyzing phylogenetic relationships.

To form an ingroup.

(sociology) The group of people who do not belong to one's own social group.

An exclusive circle of people with a common purpose

(systematics) In cladistics, all the taxa included in a study that do not belong to the ingroup that is of immediate interest.

To form an outgroup.