concentration
/ˌkɑːnsənˈtreɪʃən/
noun
[noncount] :the ability to give your attention or thought to a single object or activity :the ability to concentrate
the act of giving your attention to a single object or activity [singular]
a large amount of something in one place [count]
[count] :a large number of people in one place
[count] :the amount of an ingredient in a mixture