# extrapolation

- an act or instance of inferring an unknown from something that is known.
- Statistics, Mathematics. the act or process of estimating the value of a variable or function outside the tabulated or observed range.

## Origin of extrapolation

## Related Words for extrapolation

calculation, estimate, estimation, forecast, reckoning, prognostication, guess, computation, extrapolation## Examples from the Web for extrapolation

### Historical Examples of extrapolation

An extrapolation from the fact that there was vegetation below.

Operation: Outer SpaceWilliam Fitzgerald Jenkins

Abolish, now, one of the percipients, and the interpolation changes into ‘extrapolation.’

Essays in Radical EmpiricismWilliam James

You claim that you actually guessed where that ship was going to be, but you followed the computer's extrapolation instead?

But, I Don't ThinkGordon Randall Garrett

The last three values are those obtained by extrapolation with platinum-rhodium and platinum-iridium couples.

Abolish, now, one of the percipients, and the interpolation changes into 'extrapolation.'

The Meaning of TruthWilliam James

## Word Origin and History for extrapolation

by 1867, from extra- + back half of interpolation; original sense was "insert intermediate terms in a mathematical series." Transferred sense of "drawing a conclusion about the future based on present tendencies" is from 1889. Cf. extrapolate.

## extrapolation

A mathematical procedure designed to enable one to estimate unknown values of a parameter from known values. A common method of extrapolation is to look at data on a curve, then extend the curve into regions for which there is no data. Extrapolation is often used to predict the future.