concentration

noun concentrations

1. uncountable, usually The act, process or ability of concentrating; the process of becoming concentrated, or the state of being concentrated. The Koreans Almost all the Koreans in China live in the north-eastern provinces. The greatest concentration is found in an area of approximately 1,200 square miles in Kirin Province, an area which is part of the Yen-pien Korean Autonomous Chou.
2. uncountable, usually The direction of attention to a specific object.
3. uncountable, usually The act, process or product of reducing the volume of a liquid, as by evaporation.
4. uncountable, usually 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. uncountable, usually A field or course of study on which one focuses, especially as a student in a college or university.
6. uncountable, usually The proportion of a substance in a whole. The Koreans Almost all the Koreans in China live in the north-eastern provinces. The greatest concentration is found in an area of approximately 1,200 square miles in Kirin Province, an area which is part of the Yen-pien Korean Autonomous Chou.
7. physical, uncountable, usually The amount of solute in a solution measured in suitable units (e.g., parts per million (ppm))
8. uncountable, usually The matching game pelmanism.