extrapolate

verb

ex·​trap·​o·​late ik-ˈstra-pə-ˌlāt 

extrapolated; extrapolating

transitive verb

1

a

: 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

extrapolation

ik-ˌstra-pə-ˈlā-shən 

noun

extrapolative

ik-ˈstra-pə-ˌlā-tiv 

adjective

extrapolator

ik-ˈstra-pə-ˌlā-tər 

noun

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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.

Synonyms

• derive
• understand
• decide
• infer

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

While my research focused on the Iraqi context, the results can be extrapolated to emerging markets at large. —Midhat Zwayen, Forbes.com, 28 Aug. 2025

Again, that required extrapolating backwards. —Quanta Magazine, 21 Aug. 2025

The same information can be extrapolated by anyone above and below the title. —Tatiana Siegel, Variety, 20 Aug. 2025

When extrapolated to the size of the American whaling fleet of seven hundred and thirty-five ships in 1846 and a worldwide fleet of 900, the result is a prodigious tangle of rope. —Literary Hub, 12 Aug. 2025

Word History

Etymology

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

First Known Use

1874, in the meaning defined at transitive sense 2

Rhymes for extrapolate

• abbreviate
• accelerate
• accommodate
• accumulate
• acuminate
• adjudicate
• adulterate
• affiliate
• agglomerate
• agglutinate
• alleviate
• amalgamate

Kids Definition

extrapolate

verb

ex·​trap·​o·​late ik-ˈstrap-ə-ˌlāt 

extrapolated; extrapolating

: to work out unknown facts from known facts

extrapolation

-ˌstrap-ə-ˈlā-shən 

noun

extrapolator

-ˈstrap-ə-ˌlāt-ər 

noun