'Interpolation' definitions:

Definition of 'interpolation'

From: WordNet
noun
A message (spoken or written) that is introduced or inserted; "with the help of his friend's interpolations his story was eventually told"; "with many insertions in the margins" [syn: interpolation, insertion]
noun
(mathematics) calculation of the value of a function between the values already known
noun
The action of interjecting or interposing an action or remark that interrupts [syn: interjection, interposition, interpolation, interpellation]

Definition of 'Interpolation'

From: GCIDE
  • Interpolation \In*ter`po*la"tion\, n. [L. interpolatio an alteration made here and there: cf. F. interpolation.]
  • 1. The act of introducing or inserting anything, especially that which is spurious or foreign. [1913 Webster]
  • 2. That which is introduced or inserted, especially something foreign or spurious. [1913 Webster]
  • Bentley wrote a letter . . . . upon the scriptural glosses in our present copies of Hesychius, which he considered interpolations from a later hand. --De Quincey. [1913 Webster]
  • 3. (Math.) The method or operation of finding from a few given terms of a series, as of numbers or observations, other intermediate terms in conformity with the law of the series. [1913 Webster]