extrapolate

Verb

extrapolate (third-person singular simple present extrapolates, present participle extrapolating, simple past and past participle extrapolated)

1. (transitive) To infer by extending known information.
   • 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...1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, Chicago, Ill.: Field Museum of Natural History, →ISBN, page vii
2. (transitive) 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