EXTRAPOLATION
extrapolation
(noun) an inference about the future (or about some hypothetical situation) based on known facts and observations
extrapolation
(noun) (mathematics) calculation of the value of a function outside the range of known values
Source: WordNet® 3.1
Noun
extrapolation (countable and uncountable, plural extrapolations)
(mathematics) A calculation of an estimate of the value of some function outside the range of known values.
An inference about some hypothetical situation based on known facts.
(music) The diametric opposite of interpolation.
Source: Wiktionary