interpolate

verb3

1. •
   To introduce (something) between other things; especially to insert (possibly spurious) words into a text.

   • in verse 74, the second line is clearly interpolated, probably by some unknown medieval scribe
   • When interpolating an explanatory gloss, please enclose it in square brackets to make clear that it is interpolated.
2. •
   During the course of processing some data, and in response to a directive in that data, to fetch data from a different source and process it in-line along with the original data.

   • A macro is invoked in the same way as a request; a control line beginning .xx will interpolate the contents of macro xx. — 2007
3. •
   To estimate the value of a function between two tabulated points.