concentration
US /ˌkɑ:nsnˈtreɪʃn/
・UK /ˌkɒnsnˈtreɪʃn/
A2
noun
- Amount or number of something in a thing or place
- Paying (a lot of) attention to a task
- Amount of substance, compared to others
Examples
The greatest concentration of traffic is in the city centre.
The concentration of nitrates in the drinking water has risen in recent years.