Something that approximates

The quality of being approximate.

plural of approximability

adjacently / contiguously

(mathematics) The "best" approximation of a function by a rational function of given order. Under this technique, the approximant's power series agrees with the power series of the function it is approximating.

plural of Padé approximant

(computing) A method of finding a nearly optimal solution to an optimization problem that cannot be solved exactly within a reasonable time.

Alternative spelling of overapproximation

Alternative spelling of overapproximate

Alternative spelling of underapproximation