In math, to interpolate means to estimate the value of something given certain data. If you are looking at a chart that gives the level of pollutants in a lake on Jan. 1 and Feb. 1, you must interpolate the level for Jan. 15.
At a bake sale, if you check the cash box and look at how many cookies are left over, you can interpolate the results of your fundraiser. When you interpolate words into a text, you alter the text by adding words in. Scholars can identify the original text from material interpolated at a later date. If you are describing an author's work, you might want to interpolate a few examples of his writing into your description.
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insert words into texts, often falsifying it thereby
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estimate the value of
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