n. 集中, 专心

[化] 浓度; 浓缩

[医] 浓度, 浓缩, 浓缩物, 集中

[经] 集中

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.

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.]