Definition of concentration noun from the Oxford Advanced American Dictionary

        

    concentration

     noun
    noun
    NAmE//ˌkɑnsnˈtreɪʃn//
     
     
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  1. 1[uncountable] the ability to direct all your effort and attention on one thing, without thinking of other things This book requires a great deal of concentration. Tiredness affects your powers of concentration.
  2. 2 [uncountable] concentration (on something) the process of people directing effort and attention on a particular thing a need for greater concentration on environmental issues In his concentration on the job at hand, John allowed his normal vigilance to slip.
  3. 3[countable] concentration (of something) a lot of something in one place a concentration of industry in the north of the country
  4. 4[countable, uncountable] the amount of a substance in a liquid or in another substance glucose concentrations in the blood
See the Oxford Advanced Learner's Dictionary entry: concentration

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