Interpolation

(n.) The act of introducing or inserting anything, especially that which is spurious or foreign.

Interpolation - Other Definitions

(n.) The act of introducing or inserting anything, especially that which is spurious or foreign.
(n.) That which is introduced or inserted, especially something foreign or spurious.
(n.) The method or operation of finding from a few given terms of a series, as of numbers or observations, other intermediate terms in conformity with the law of the series.