concentrate

make more concise

draw together or meet in one common center

“These groups concentrate in the inner cities”

make denser, stronger, or purer

“concentrate juice”

direct one's attention on something

be cooked until very little liquid is left

make central

compress or concentrate

cook until very little liquid is left

the desired mineral that is left after impurities have been removed from mined ore

a concentrated example of something

“the concentrate of contemporary despair”

a concentrated form of a foodstuff; the bulk is reduced by removing water