concentration - definition in the American English Dictionary - Cambridge Dictionaries Online

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English definition of “concentration”

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concentration

noun  us   /ˌkɑn·sənˈtreɪ·ʃən/

concentration noun (COMING TOGETHER)

a large amount of something in the same place: [C] There’s a heavy concentration of poor and elderly in the district.

concentration noun (GIVING ATTENTION)

[U] a lot of attention and thought directed to an activity or subject: He had a look of intense concentration on his face.

concentration noun (SUBSTANCE)

the amount of a substance that is mixed with water or another substance
(Definition of concentration from the Cambridge Academic Content Dictionary © Cambridge University Press)
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