Pronunciation: (in-tûr"pu-lā'shun),[key] —n. 1. the act or process of interpolating or the state of being interpolated.
2. something interpolated, as a passage introduced into a text.
3. Math. a. the process of determining the value of a function between two points at which it has prescribed values.
b. a similar process using more than two points at which the function has prescribed values.
c. the process of approximating a given function by using its values at a discrete set of points.