out-group

[out-groop] /ˈaʊtˌgrup/
noun, Sociology
1.
people outside one's own group, especially as considered to be inferior or alien; a group perceived as other than one's own.
Compare in-group.
Origin
1905-10; out- + group
British Dictionary definitions for out-group

out-group

noun
1.
(sociol) persons excluded from an in-group