Meaning of CONCENTRATION in English

CONCENTRATION

/ ˌkɒnsnˈtreɪʃn; NAmE ˌkɑːn-/ noun

1.

[ U ] 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.

[ U ] concentration (on sth) the process of people directing effort and attention on a particular thing :

a need for greater concentration on environmental issues

3.

[ C ] concentration (of sth) a lot of sth in one place :

a concentration of industry in the north of the country

4.

[ C , U ] the amount of a substance in a liquid or in another substance :

glucose concentrations in the blood

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.