Interpolation

Noun

1. An abrupt change in elements, with continuation of the first idea.
2. The process of estimating the value of a function at a point from its values at nearby points.
3. The process of interpolating: including and processing externally-fetched data in a document or program.
4. That which is introduced or inserted; in contexts of content analysis of centuries-old texts, especially something foreign or spurious.

   "Today a widely established convention encloses all editorial interpolations in square brackets [like so] for clarity."

5. The use of a melody from a previously recorded song, but recreated rather than sampled from that recording.