interpolation

noun5

1. •
   An abrupt change in elements, with continuation of the first idea.
2. •
   The process of interpolating: including and processing externally-fetched data in a document or program.
3. •
   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.
4. •
   The use of a melody from a previously recorded song, but recreated rather than sampled from that recording.

   • The melody itself is an interpolation of "The Streets of Cairo," an Orientalist Tin Pan Alley song originally published in 1895. — 2015
5. •
   The process of estimating the value of a function at a point from its values at nearby points.