extrapolation

noun

1. (countable, uncountable)A calculation of an estimate of the value of some function outside the range of known values.
2. (countable, uncountable)An inference about some hypothetical situation based on known facts.

   “Casting further doubt on Kerner’s extrapolations from Gebhard’s data, it’s unclear what happened during those 21 minutes of foreplay. Blow jobs? Kissing? Role-playing? We don’t know.”

3. (countable, uncountable)The diametric opposite of interpolation.