Definition of concentration noun from the Oxford Advanced Learner's Dictionary

        

    concentration

     noun
    noun
    BrE BrE//ˌkɒnsnˈtreɪʃn//
     
    ; NAmE NAmE//ˌkɑːnsnˈtreɪʃn//
     
     
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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 in 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
  5. Extra examples Don’s voice from outside broke my concentration. Evaporation gradually increases the salt concentration of the water. One momentary lapse in concentration could prove fatal. She has great powers of concentration for a child her age. The concentration of nitrates in the drinking water has risen in recent years. The game requires great concentration. The greatest concentration of traffic is downtown. The greatest concentration of traffic is in the city centre. a look of total concentration on her face his concentration on his writing He stressed the need for greater concentration on environmental issues. The noise had disturbed his concentration.
See the Oxford Advanced American Dictionary entry: concentration

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