Pre-concentration

[kon-suh n-trey-shuh n] /ˌkɒn sənˈtreɪ ʃən/
noun
1.
the act of concentrating; the state of being concentrated.
2.
exclusive attention to one object; close mental application.
3.
something concentrated:
a concentration of stars.
4.
Military.

the assembling of military or naval forces in a particular area in preparation for further operations.
a specified intensity and duration of artillery fire placed on a small area.

5.
the focusing of a student’s academic program on advanced study in a specific subject or field.
6.
Chemistry. (in a solution) a measure of the amount of dissolved substance contained per unit of volume.
7.
Also called memory. Cards. a game in which all 52 cards are spread out face down on the table and each player in turn exposes two cards at a time and replaces them face down if they do not constitute a pair, the object being to take the most pairs by remembering the location of the cards previously exposed.
concentration
/ˌkɒnsənˈtreɪʃən/
noun
1.
intense mental application; complete attention
2.
the act or process of concentrating
3.
something that is concentrated
4.
the strength of a solution, esp the amount of dissolved substance in a given volume of solvent, usually expressed in moles per cubic metre or cubic decimetre (litre) c
5.
the process of increasing the concentration of a solution
6.
(military)

the act of bringing together military forces
the application of fire from a number of weapons against a target

7.
(economics) the degree to which the output or employment in an industry is accounted for by only a few firms
8.
another name (esp US) for Pelmanism

concentration con·cen·tra·tion (kŏn’sən-trā’shən)
n.

An increase of the strength of a pharmaceutical preparation by the extraction, precipitation, and drying of its crude active agent.

An increase in the strength of a fluid or gas in a mixture by purification, evaporation, or diffusion.

The amount of a specified substance in a unit amount of another substance.

concentration
(kŏn’sən-trā’shən)
The amount of a particular substance in a given amount of another substance, especially a solution or mixture.