How do you spell Hannukah?


[ik-strap-uh-leyt] /ɪkˈstræp əˌleɪt/
verb (used with object), extrapolated, extrapolating.
to infer (an unknown) from something that is known; conjecture.
Statistics. to estimate (the value of a variable) outside the tabulated or observed range.
Mathematics. to estimate (a function that is known over a range of values of its independent variable) to values outside the known range.
verb (used without object), extrapolated, extrapolating.
to perform extrapolation.
1825-35; extra- + (inter)polate
Related forms
extrapolation, noun
extrapolative, extrapolatory
[ik-strap-uh-luh-tawr-ee, -tohr-ee] /ɪkˈstræp ə ləˌtɔr i, -ˌtoʊr i/ (Show IPA),
extrapolator, noun
overextrapolation, noun
Can be confused Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
Examples from the web for extrapolating
  • And when that happens, the futurologists aren't far behind, extrapolating and predicting the way things will be.
  • Any set of predictions depends on some mix of extrapolating from current trends and hypothesizing newer directions.
  • But there's more to harnessing an army of computers than testing a hypothesis or extrapolating real-world observations.
  • My optimism stems merely from extrapolating the present growth rate of computer technology.
  • extrapolating from what a non human species does in a lab experiment does not reveal information about the human species.
  • extrapolating from indeterminacy at the subatomic level is hardly conclusive.
  • In your argument you are extrapolating from the hot hands papers which looked at runs of individual shots to team winning streaks.
  • We should always be careful of extrapolating trends out, of course.
  • In extrapolating from rodents to people, however, these writers were making a giant leap.
  • Obviously there needs to be more work done, and extrapolating from one sample will not do.
British Dictionary definitions for extrapolating


(maths) to estimate (a value of a function or measurement) beyond the values already known, by the extension of a curve Compare interpolate (sense 4)
to infer (something not known) by using but not strictly deducing from the known facts
Derived Forms
extrapolation, noun
extrapolative, extrapolatory, adjective
extrapolator, noun
Word Origin
C19: extra- + -polate, as in interpolate
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Word Origin and History for extrapolating



1874, a back-formation from extrapolation by analogy of interpolate. Said in early references to be an expression of Sir George Airy (1801-1892), English mathematician and astronomer. Related: Extrapolated; extrapolating.

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
extrapolating in Science
To estimate the value of a quantity that falls outside the range in which its values are known.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source

Word of the Day

Difficulty index for extrapolate

Few English speakers likely know this word

Word Value for extrapolating

Scrabble Words With Friends