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Ethnicity is one of the less precise terms in the vocabulary of social science. Most frequently used in reference to language, its meaning is sometimes extended to cover common social, cultural, and physical characteristics transmitted as a matter of inheritance and capable of producing social solidarities based on affect. So defined, ethnicity has both subjective and objective dimensions, for it refers both to perceptible traits and to perception whereby the former assume social relevance.
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Andrew C. Janos (1971) studied this question.
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