ethnos
/ˈɛθnɒs/noun
1 Cultural Anthropol. A population group regarded as having a common descent, or having a common national or cultural tradition.
2 Ancient History. A form of community or state in ancient Greece, existing outside the city-state, and organized in a variety of ways.
Origin
Late 19th century; earliest use found in The Illustrated London News. From ancient Greek ἔθνος nation, people.