[ik-strap-uh-leyt] /ɪkˈstræp əˌleɪt/

verb (used with object), extrapolated, extrapolating.
to infer (an unknown) from something that is known; conjecture.
Statistics. to estimate (the value of a variable) outside the tabulated or observed range.
Mathematics. to estimate (a function that is known over a range of values of its independent variable) to values outside the known range.
verb (used without object), extrapolated, extrapolating.
to perform extrapolation.
(maths) to estimate (a value of a function or measurement) beyond the values already known, by the extension of a curve Compare interpolate (sense 4)
to infer (something not known) by using but not strictly deducing from the known facts

1874, a back-formation from extrapolation by analogy of interpolate. Said in early references to be an expression of Sir George Airy (1801-1892), English mathematician and astronomer. Related: Extrapolated; extrapolating.
To estimate the value of a quantity that falls outside the range in which its values are known.


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