(3) The increase of strength of a pharmaceutical preparation.
(4) The act or process of focusing or fixing of attention.
(5) The product of something concentrated.
In chemistry, concentration of a solute in a solution can be done by chemical means, e.g. evaporation of the solvent, diffusion, and purification. In pharmacology, concentration of a pharmaceutical preparation can be done by extraction, precipitation and drying of the crude active agent.