1.(mathematics) calculation of the value of a function outside the range of known values (Freq. 3) • Derivationally related forms: extrapolate • Topics: mathematics, math, maths • Hypernyms: calculation, computation, figuring, reckoning 2. an inference about the future (or about some hypothetical situation) based on known facts and observations • Derivationally related forms: extrapolate • Hypernyms: inference, illation