extrapolate

verb
ex·​trap·​o·​late | \ ik-ˈstra-pə-ˌlāt How to pronounce extrapolate (audio) \
extrapolated; extrapolating

Definition of extrapolate

transitive verb

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

intransitive verb

: to perform the act or process of extrapolating

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Other Words from extrapolate

extrapolation \ ik-​ˌstra-​pə-​ˈlā-​shən How to pronounce extrapolation (audio) \ noun
extrapolative \ ik-​ˈstra-​pə-​ˌlā-​tiv How to pronounce extrapolative (audio) \ adjective
extrapolator \ ik-​ˈstra-​pə-​ˌlā-​tər How to pronounce extrapolator (audio) \ noun

The Many Uses of Extrapolate

Scientists worry about the greenhouse effect because they have extrapolated the rate of carbon-dioxide buildup and predicted that its effect on the atmosphere will become increasingly severe. On the basis of their extrapolations, they have urged governments and businesses to limit factory and automobile emissions. Notice that it's acceptable to speak of extrapolating existing data (to produce new data), extrapolating from existing data (to produce new data), or extrapolating new data (from existing data)—in other words, it isn't easy to use this word wrong.

Examples of extrapolate in a Sentence

We can extrapolate the number of new students entering next year by looking at how many entered in previous years. With such a small study it is impossible to extrapolate accurately.

Recent Examples on the Web

Brennan researchers Ames Grawert and Cameron Kimble extrapolated the available data to project the full crime rates for 2018 in the biggest US cities. German Lopez, Vox, "Crime and murder fell in America’s most populous cities in 2018," 18 Dec. 2018 Economists who have reviewed the report caution that measuring the present need for housing by extrapolating from past production is imperfect. Laura Kusisto, WSJ, "Homebuilding Isn’t Keeping Up With Growth, Development Group Says," 16 Apr. 2018 The team extrapolated how many unclassified drug overdose deaths were probably opioid related in each state. NBC News, "Opioid overdose deaths may be undercounted by 70,000," 27 June 2018 Researchers must extrapolate a smaller amount of data over an area the size of the United States, which can make the analysis less precise. Kendra Pierre-louis, New York Times, "Antarctica Is Melting Three Times as Fast as a Decade Ago," 13 June 2018 Investors are heavily influenced by the recent past, and tend to extrapolate it too far into the future. James Mackintosh, WSJ, "Calling Bull on the Longest Bull Market," 22 Aug. 2018 From that base of survey data, the researchers extrapolated to the whole island and came up with a range of excess deaths. Washington Post, "The Health 202: Medicaid expansion in red states is likely to come via voters in November," 4 June 2018 The Gilead writers aren’t just extrapolating from Atwood’s ideas or referencing the mistreatment of women throughout human history. Joanna Weiss, BostonGlobe.com, "In a #MeToo world, the dark allure of ‘The Handmaid’s Tale’," 27 May 2018 And Voyles points out that the study is limited geographically and cannot be used to extrapolate a broad truth about a global problem. The Washington Post, NOLA.com, "Some endangered frogs may be leaping back from extinction," 17 May 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'extrapolate.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of extrapolate

1874, in the meaning defined at transitive sense 2

History and Etymology for extrapolate

Latin extra outside + English -polate (as in interpolate) — more at extra-

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Last Updated

10 Mar 2019

Look-up Popularity

Time Traveler for extrapolate

The first known use of extrapolate was in 1874

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More Definitions for extrapolate

extrapolate

verb

English Language Learners Definition of extrapolate

formal : to form an opinion or to make an estimate about something from known facts

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