An interpolation is an interruption or an addition inserted into something spoken or written. If you’re telling someone about the wild day you had, and your best friend keeps interrupting you to add details, that’s interpolation.

Notice how interpolation looks a lot like interruption and interjection? It means something very similar. If you tell a story and then add some new parts, those are interpolations. If someone else adds new parts as you’re telling the story, that’s interpolation, too. Many ancient books have had new interpolations added every time they were printed. All interpolations add something to the original.

Definitions of interpolation
  1. noun
    the action of interjecting or interposing an action or remark that interrupts
    synonyms: interjection, interpellation, interposition
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    type of:
    break, disruption, gap, interruption
    an act of delaying or interrupting the continuity
  2. noun
    a message (spoken or written) that is introduced or inserted
    “with the help of his friend's interpolations his story was eventually told”
    synonyms: insertion
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    type of:
    content, message, subject matter, substance
    what a communication that is about something is about
  3. noun
    (mathematics) calculation of the value of a function between the values already known
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    type of:
    calculation, computation, figuring, reckoning
    problem solving that involves numbers or quantities
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