concentration

noun8

1. •
   The act, process or ability of concentrating; the process of becoming concentrated, or the state of being concentrated.
2. •
   full attention kept on one thing and nothing else
3. •
   The act, process or product of reducing the volume of a liquid, as by evaporation.
4. •
   The act or process of removing the dress of ore and of reducing the valuable part to smaller compass, as by currents of air or water.
5. •
   The proportion of a substance in a whole.
6. •
   The amount of solute in a solution measured in suitable units (e.g., parts per million (ppm))
7. •
   A field or course of study on which one focuses, especially as a student in a college or university.
8. •
   The matching game pelmanism.