Dephlegmation \De`phleg*ma"tion\, n. [Cf. F. d['e]flegmation.]

(Chem.) The operation of separating water from spirits and acids, by evaporation or repeated distillation; -- called also concentration, especially when acids are the subject of it. [Obs.]

Source: Webster's Revised Unabridged Dictionary (1913)
 

Concentration \Con`cen*tra"tion\, n. [Cf. F. concentration.]

1. The act or process of concentrating; the process of becoming concentrated, or the state of being concentrated; concentration.

Concentration of the lunar beams. --Boyle.

Intense concetration of thought. --Sir J. Herschel.

2. The act or process of reducing the volume of a liquid, as by evaporation.

The acid acquires a higher degree of concentration. --Knight.

3. (Metal.) 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.

Source: Webster's Revised Unabridged Dictionary (1913)