extrapolate

[ik-strap-uh-leyt]
verb (used with object), extrapolated, extrapolating.
1.
to infer (an unknown) from something that is known; conjecture.
2.
Statistics. to estimate (the value of a variable) outside the tabulated or observed range.
3.
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.
4.
to perform extrapolation.

Origin:
1825–35; extra- + (inter)polate

extrapolation, noun
extrapolative, extrapolatory [ik-strap-uh-luh-tawr-ee, -tohr-ee] , adjective
extrapolator, noun
overextrapolation, noun

deduction, extrapolation, induction, generalization, hypothesis.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
extrapolate (ɪkˈstræpəˌleɪt)
 
vb
1.  maths Compare interpolate to estimate (a value of a function or measurement) beyond the values already known, by the extension of a curve
2.  to infer (something not known) by using but not strictly deducing from the known facts
 
[C19: extra- + -polate, as in interpolate]
 
extrapo'lation
 
n
 
ex'trapolative
 
adj
 
ex'trapolatory
 
adj
 
ex'trapolator
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

extrapolate
1874, a back formation from extrapolation. Said in earliest reference to be "an expression of Sir George Airy" (18011892), English mathematician and astronomer. Related: Extrapolated; extrapolating.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
extrapolate   (ĭk-strāp'ə-lāt')  Pronunciation Key 
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.
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FOLDOC
Computing Dictionary

extrapolate definition


extrapolation

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
It's harder to extrapolate with little or no data.
Still, many economists warn that it's difficult to extrapolate from these
  blades of grass.
You cannot extrapolate a generalization based upon a handful of data.
We don't know enough to really extrapolate any sort of real pattern.
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