What does CONCENTRATE mean?

verb

1. make denser, stronger, or purer“concentrate juice”
2. direct one's attention on something“Please focus on your studies and not on your hobbies”
3. make central“The Russian government centralized the distribution of food”
4. make more concise“condense the contents of a book into a summary”
5. draw together or meet in one common center“These groups concentrate in the inner cities”
6. compress or concentrate“Congress condensed the three-year plan into a six-month plan”
7. be cooked until very little liquid is left“The sauce should reduce to one cup”
8. cook until very little liquid is left“The cook reduced the sauce by boiling it for a long time”