Definitions from Wiktionary (concentration)

▸ noun:  The act, process or ability of concentrating; the process of becoming concentrated, or the state of being concentrated.
▸ noun:  The direction of attention to a specific object.
▸ noun:  The act, process or product of reducing the volume of a liquid, as by evaporation.
▸ noun:  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.
▸ noun:  A field or course of study on which one focuses, especially as a student in a college or university.
▸ noun:  The proportion of a substance in a whole.
▸ noun:  (physical chemistry) The amount of solute in a solution measured in suitable units (e.g., parts per million (ppm))
▸ noun:  The matching game pelmanism.
▸ Also see concentration

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