interpolation

Short definition from Wiktionary

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 interpolating: including and processing externally-fetched data in a document or program.
4. 4
   That which is introduced or inserted; in contexts of content analysis of centuries-old texts, especially something foreign or spurious.
5. 5
   The use of a melody from a previously recorded song, but recreated rather than sampled from that recording.