extrapolation

/ɪkˌstræpəˈleɪʃən/
noun
  1. The act or process of estimating something unknown by using known facts or extending a trend; a conclusion reached by this method.
    • Making an extrapolation without enough evidence can lead to wrong conclusions.
    • The economist's extrapolation of next year's inflation rate worried investors.
    • His theory was based on an extrapolation from a small sample of data.
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