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English definition of “concentration”

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concentration

noun uk   /ˌkɒn.sənˈtreɪ.ʃən/ us    /ˌkɑːn-/

concentration noun (ATTENTION)

B2 [U] the ability to think carefully about something you are doing and nothing else: The noise outside made concentration difficult. There was a look of intense concentration on her face. I find that yoga improves my powers of concentration. I found it hard to follow what the teacher was saying, and eventually I lost concentration. The government's concentration on tax reduction has won them a lot of support.
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concentration noun (AMOUNT)

C2 [C or U] a large number or amount of something in the same place: There is a heavy concentration of troops in the area. [C or U] specialized chemistry the exact amount of one particular substance that is found in another substance: a concentration of one part per million High concentrations of toxic elements were found in the polluted areas.
(Definition of concentration from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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