extrapolation vs reckoning

extrapolation

noun
  • A calculation of an estimate of the value of some function outside the range of known values. 

  • The diametric opposite of interpolation. 

  • An inference about some hypothetical situation based on known facts. 

reckoning

noun
  • The action of calculating or estimating something. 

  • The working out of consequences or retribution for one's actions. 

  • An opinion or judgement. 

  • A summing up or appraisal. 

  • The settlement of accounts, as between parties. 

How often have the words extrapolation and reckoning occurred in a corpus of books? (source: Google Ngram Viewer )