Members of ethnic groups; people identified by their ethnic origin, cultural background, or national heritage.
From 'ethnic' (from Greek ethnos, people) used as a noun with the plural suffix '-s', a term that became more common in mid-20th century sociology and demographics.
The word 'ethnics' was commonly used in 20th-century American sociology to describe immigrant communities, though modern usage prefers terms like 'ethnic groups' to avoid reducing people to a single identity!
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