Source : Webster's Revised Unabridged Dictionary (1913)

Interpolate \In*ter"po*late\, v. t. [imp. & p. p.
   {Interpolated}; p. pr. & vb. n. {Interpolating}.] [L.
   interpolatus, p. p. of interpolare to form anew, to
   interpolate, fr. interpolus, interpolis, falsified, vamped
   up, polished up; inter between + polire to polish. See
   {Polish}, v. t.]
   1. To renew; to carry on with intermission. [Obs.]

            Motion . . . partly continued and unintermitted, . .
            . partly interpolated and interrupted. --Sir M.
                                                  Hale.

   2. To alter or corrupt by the insertion of new or foreign
      matter; especially, to change, as a book or text, by the
      insertion of matter that is new, or foreign to the purpose
      of the author.

            How strangely Ignatius is mangled and interpolated,
            you may see by the vast difference of all copies and
            editions.                             --Bp. Barlow.

            The Athenians were put in possession of Salamis by
            another law, which was cited by Solon, or, as some
            think, interpolated by him for that purpose. --Pope.

   3. (Math.) To fill up intermediate terms of, as of a series,
      according to the law of the series; to introduce, as a
      number or quantity, in a partial series, according to the
      law of that part of the series.

Source : WordNet®

interpolate
     v 1: estimate the value of [syn: {extrapolate}]
     2: insert words into texts, often falsifying it thereby [syn: {alter},
         {falsify}]