Definition of extrapolate
1a : to predict by projecting past experience or known data extrapolate public sentiment on one issue from known public reaction on others
b : to project, extend, or expand (known data or experience) into an area not known or experienced so as to arrive at a usually conjectural knowledge of the unknown area extrapolates present trends to construct an image of the future
2 : to infer (values of a variable in an unobserved interval) from values within an already observed interval
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