n. The act of dispersing or scattering.n. The state of being dispersed or scattered abroad: as, the dispersion of the Jews.n. In optics, the separation of the different colored rays in refraction, arising from their different, wave-lengths.n. In medicine and surgery, the scattering or removal of inflammation from a part and the restoration of the part to its natural state.n. In mathematics, the excess of the average value of a function at less than an infinitesimal distance from a point over the value at that point, this excess being divided by 1/10 of the square of the limiting infinitesimal distance.n. In physiol, optics, the blurring of the retinal image due to faulty accommodation.n. In botany, the distribution of seeds and of plants by various means, as by the wind, by birds and animals, etc.n. The tendency of material particles or bodies, including conscious individuals, to go apart, as from a center; hence, in the phenomena of population, the continual breaking down and dispersing of aggregations, counteracting a tendency toward concentration. See law of *aggregation.