Meaning of “concentration” in the English Dictionary

"concentration" in English

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uk /ˌkɒn.sənˈtreɪ.ʃən/ us /ˌkɑːn.sənˈtreɪ.ʃən/

concentration noun (ATTENTION)

B2 [ U ] the ability to think carefully about something you are doing and nothing else:

The noise outside made concentration difficult.
There was a look of intense concentration on her face.
I find that yoga improves my powers of concentration.
It was hard to follow what the teacher was saying, and eventually I lost concentration.
The party's concentration on tax reduction has won them a lot of support.

More examples

concentration noun (AMOUNT)

C2 [ C or U ] a large number or amount of something in the same place:

There is a heavy concentration of troops in the area.

[ C or U ] specialized chemistry the exact amount of one particular substance that is found in another substance:

a concentration of one part per million
High concentrations of toxic elements were found in the polluted areas.

concentration noun (GAME)

[ U ] US UK pelmanism a card game in which players use their memory to try to find pairs of matching cards, turning over two cards at a time from a set of cards that are spread out face (= picture side) down

(Definition of “concentration” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"concentration" in American English

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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)

"concentration" in Business English

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uk /ˌkɒnsənˈtreɪʃən/ us

[ C or U ] the fact of there being a large number or amount of people or things of the same type in the same place:

The state's highest concentration of wealth is in the metro areas.
Denver has one of the biggest concentrations of tech workers in the country.
By identifying geographical concentrations of industries, we can identify training needs that exist in those regions.

[ U ] the fact of things being combined into a single group, or controlled by the same person or organization:

This situation has resulted in the concentration of the industry in the hands of a few multinational companies.

[ U ] the ability to give all of your attention to one particular activity, subject, or problem:

Low costs and concentration on core business activities form the basis of our success.
Many of the mistakes she made in the job were due to a lack of concentration.

(Definition of “concentration” from the Cambridge Business English Dictionary © Cambridge University Press)