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concentration
mastery UK /ˌkɒn.sənˈtɹeɪ.ʃən/ US /ˌkɑn.sənˈtɹeɪ.ʃən/noun
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Which word is closest in meaning to 'concentration' in this sentence?
The greatest concentration is found in an area of approximately 1,200 square miles in Kirin Province.