To Interpolate

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

2. (mathematics) To estimate the value of a function between two points between which it is tabulated.
3. (computing) 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.

(process fetched data in-line): transclude