verb ex·trap·o·late \ik-ˈstra-pə-ˌlāt\

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


Full Definition of EXTRAPOLATE

transitive verb
:  to infer (values of a variable in an unobserved interval) from values within an already observed interval
a :  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>
b :  to predict by projecting past experience or known data <extrapolate public sentiment on one issue from known public reaction on others>
intransitive verb
:  to perform the act or process of extrapolating
ex·trap·o·la·tion \-ˌstra-pə-ˈlā-shən\ noun
ex·trap·o·la·tive \-ˈstra-pə-ˌlā-tiv\ adjective
ex·trap·o·la·tor \-ˌlā-tər\ noun


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


Latin extra outside + English -polate (as in interpolate) — more at extra-
First Known Use: 1874


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