interpolation

noun

1. 1

   An abrupt change in elements, with continuation of the first idea.

2. 2

   The process of estimating the value of a function at a point from its values at nearby points.

3. 3

   The process of including and processing externally-fetched data in a document or program; see interpolate.

4. 4

   That which is introduced or inserted, especially something foreign or spurious.