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extrapolate
verb
Reveal meaning and examples
To estimate beyond known observations by extending a pattern or relationship.
The analyst was cautious about trying to extrapolate from such a short record.
A library group considered a hypothetical plan to extend a small reading event into a full weekend program. Their attendance forecast was conjectural because it rested on only two earlier evenings and several untested assumptions about interest. One member wanted to extrapolate a weekend total from the average turnout at those evenings.