extrapolate(redirected from extrapolatory)
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To infer a point between two given, or known, points on a graph or progression. Thus, if an infant weighed 20 lb at a certain age and 4 months later weighed 23 lb, it could be inferred that at a point halfway between the two time periods, the infant might have weighed 21.5 lb.
v to infer values beyond the observable range from an observed trend of variables; to project by inference into the unexplored.