concentration

Noun

concentration (usually uncountable, plural concentrations)

1. (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.1972, Leo A. Orleans, Every Fifth Child: The Population of China, Stanford, CA: Stanford University Press, →ISBN, →LCCN, →OCLC, →OL, page 117
   1. (usually) The direction of attention to a specific object.
   2. (usually) The act, process or product of reducing the volume of a liquid, as by evaporation.
   3. (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.
2. (usually) A field or course of study on which one focuses, especially as a student in a college or university.
3. (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.1972, Leo A. Orleans, Every Fifth Child: The Population of China, Stanford, CA: Stanford University Press, →ISBN, →LCCN, →OCLC, →OL, page 117
   • Surprisingly, this analysis revealed that acute exposure to solvent vapors at concentrations below those associated with long-term effects appears to increase the risk of a fatal automobile accident. Furthermore, this increase in risk is comparable to the risk of death from leukemia after long-term...2013 July-August, Philip J. Bushnell, “Solvents, Ethanol, Car Crashes & Tolerance”, in American Scientist
   1. (physical, usually) The amount of solute in a solution measured in suitable units (e.g., parts per million (ppm))
4. (usually) The matching game pelmanism.