concentrate
US /ˈkɑːn.sən.treɪt/
UK /ˈkɑːn.sən.treɪt/

1.
focus all one's attention on a particular object or activity
:
•
I need to concentrate on my studies.
•
It's hard to concentrate with all this noise.
2.
increase the strength or density of a solution or mixture by removing water or other diluting agents
:
•
The juice is concentrated by boiling.
•
We need to concentrate the chemical solution.