Ethnicity (noun)

1. The state or fact of belonging to a certain ethnic group.
2. A group of people who share a common culture, heritage, and history.

Origin:

From german ethnie, from french ethnie, from new latin ethnia, from ancient greek ἔθνος (éthnos, "people, natio.n")

Examples:

1. Her ethnicity is African American.
2. The city is known for its diverse ethnic neighborhoods.
3. The ethnicity of the population is changing with immigration.
4. The study looked at the relationship between income and ethnicity.
5. Ethnicity can be an important aspect of one's identity.