1.  interpolate(v = verb.cognition) extrapolate - estimate the value of;
is one way to calculate, cipher, compute, cypher, figure, reckon, work out
Derived form noun interpolation₂
Sample sentences: Somebody ----s something

2.  interpolate(v = verb.change) alter, falsify - insert words into texts, often falsifying it thereby;
is one way to edit, redact
Derived forms noun interpolation₃, noun interpolation₁
Sample sentences: Somebody ----s something

1.  To renew; to carry on with intermission. [1913 Webster]
"Motion . . . partly continued and unintermitted, . . . partly interpolated and interrupted." [1913 Webster]

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. [1913 Webster]
"How strangely Ignatius is mangled and interpolated, you may see by the vast difference of all copies and editions." [1913 Webster]
"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." [1913 Webster]

3.  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; to estimate a value at a point intermediate between points of knwon value. Compare extrapolate. [1913 Webster]

interpolate, v.tr.
1 a insert (words) in a book etc., esp. to give false impressions as to its date etc. b make such insertions in (a book etc.).
2 interject (a remark) in a conversation.
3 estimate (values) from known ones in the same range.

Derivative:
interpolation n. interpolative adj. interpolator n.

Etymology:
L interpolare furbish up (as INTER-, polire POLISH(1))

VB  lie between, come between, get between, intervene, slide in, interpenetrate, permeate, put between, introduce, import, throw in, wedge in, edge in, jam in, worm in, foist in, run in, plow in, work in, interpose, interject, intercalate, interpolate, interline, interleave, intersperse, interweave, interlard, interdigitate, sandwich in, fit in, squeeze in, let in, dovetail, splice, mortise, insinuate, smuggle, infiltrate, ingrain, interfere, put in an oar, thrust one's nose in, intrude, obtrude, have a finger in the pie, introduce the thin end of the wedge, thrust in.