Medical Definition of concentration
1: the act or action of concentrating: asa: a directing of the attention or of the mental faculties toward a single objectb: an increasing of strength (as of a solute or a gas in a mixture) 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 active principle 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 a solution, mixture, or dispersion that may be expressed in percentage by weight or by volume, in parts per million, or in grams per liter
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