\In`te*gra"tion\, n. [L. integratio a renewing,
restoring: cf. F. int['e]gration.]
1. The act or process of making whole or entire.

2. (Math.) The operation of finding the primitive function
   which has a given function for its differential
   coefficient. See {Integral}.

Note: The symbol of integration is [integral2l] (standing for
      the Latin summa sum), and the integral is also regarded
      as the limiting value of the sum of great numbers of
      differentials, when the magnitude of the differentials
      decreases, and their number increases indefinitely. See
      {Limit}, n. When the summation is made between
      specified values of the variable, the result is a
      definite integral, and those values of the variable are
      the limits of the integral. When the summation is made
      successively for two or more variables, the result is a
      {multiple integral}.

3. In the theory of evolution: The process by which the
   manifold is compacted into the relatively simple and
   permanent. It is supposed to alternate with
   differentiation as an agent in development.