concentration

con·cen·tra·tion   (kŏn'sən-trā'shən)    n.   The act or process of concentrating, especially the fixing of close, undivided attention. The condition of being concentrated. Something that has been concentrated. Chemistry The amount of a specified substance in a unit amount of another substance.

Main Entry: con·cen·tra·tion
Pronunciation: "kän(t)-s&n-'trA-sh&n, -"sen-
Function: noun
1 : the act or action ofconcentrating: as a : a directing of the attention or of the mental faculties toward a single object b : an increasing of strength (as of a solute or a gas in amixture) or a purifying by partial or total removal of diluents, solvents, admixed gases, extraneous material, or waste (as by evaporation or diffusion)
2 : a crude activeprinciple of a vegetable especially for pharmaceutical use in the form of a powder or resin
3 : the relative content of a component (as dissolved or dispersed material) of asolution, mixture, or dispersion that may be expressed in percentage by weight or by volume, in parts per million, or in grams per liter

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

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

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

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

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