Definition of "extrapolate"

extrapolate

/ɛkˈstɹæp.əˌleɪt/

verb
third-person singular simple present extrapolates, present participle extrapolating, simple past and past participle extrapolated
1. (transitive) To infer by extending known information.
  Quotations
  With fresh material, taxonomic conclusions are leavened by recognition that the material examined reflects the site it occupied; a herbarium packet gives one only a small fraction of the data desirable for sound conclusions. Herbarium material does not, indeed, allow one to extrapolate safely: what you see is what you get […]
  1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, New York, N.Y.: Columbia University Press, page vii
2. (transitive, mathematics) To estimate the value of a variable outside a known range from values within that range by assuming that the estimated value follows logically from the known ones