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extrapolate

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verb [intransitive/transitive] American English pronunciation: extrapolate /ɪkˈstræpəˌleɪt/ 
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present tense
I/you/we/theyextrapolate
he/she/itextrapolates
present participleextrapolating
past tenseextrapolated
past participleextrapolated
  1. 1
    formal to say what is likely to happen or be true by using information that you already have

    It's possible to predict students' success by extrapolating from current exam scores.

derived word

extrapolation

 American English pronunciation: extrapolation /ɪkˌstræpəˈleɪʃ(ə)n/  noun [countable/uncountable]
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singularextrapolation
pluralextrapolations

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