Possible Definitions:
1. Concentration (n.) The act or process of concentrating; the process of becoming concentrated, or the state of being concentrated; concentration.
2. Concentration (n.) The act or process of reducing the volume of a liquid, as by evaporation.
3. Concentration (n.) 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.
