| concentration | |
| 1. n. The act, process or ability of concentrating; the process of becoming concentrated, or the state of being concentrated. | |
| 2. n. The direction of attention to a specific object. | |
| 3. n. The act, process or product of reducing the volume of a liquid, as by evaporation. | |
| 4. 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. | |
| 5. n. A field or course of study on which one focuses, especially as a student in a college or university. | |
| 6. n. The proportion of a substance in a whole. | |
| 7. n. (chemistry) The amount of solute in a solution measured in suitable units (e.g., parts per million (ppm)) | |
| 8. n. The matching game pelmanism. | |
