Definition of "interpolate"

interpolate

/ɪn.ˈtɜɹ.pə.ˌleɪt/

verb
third-person singular simple present interpolates, present participle interpolating, simple past and past participle interpolated
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 tabulated points.
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.
  Quotations
  A macro is invoked in the same way as a request; a control line beginning .xx will interpolate the contents of macro xx.
  2007, Joseph F. Ossanna, Nroff/Troff User's manual
  In Perl, variable interpolation happens in double-quoted strings and patterns, and list interpolation occurs when constructing the list of values to pass to a list operator or other such construct that takes a LIST.
  2000, Wall, Christiansen, Jon Orwant, Programming Perl, 3rd edition, page 992