n. The act of integrating, or bringing together the parts of an integral whole; the act of segregating and bringing together similar particles.n. In mathematics, the operation inverse to differentiation; the operation of finding the integral of a function or of an equation.n. The inference of subcontrariety from “Some A is B” to “Some A is not B.”n. The determination of the average rate of flow of a stream. On account of the varying friction against the bottom, sides, and overlying air, this value, as a rule, differs from the rate at any particular place in the cross-section of the stream.