autopsy vs datum

autopsy

noun
  • An eyewitness observation, the presentation of an event as witnessed. 

  • An after-the-fact examination, especially of the causes of a failure. 

  • A dissection performed on a cadaver to find possible cause(s) of death. 

verb
  • To perform an autopsy on. 

  • To perform an after-the-fact analysis of, especially of a failure. 

datum

noun
  • A fact known from direct observation. 

  • A premise from which conclusions are drawn. 

  • A floating reference point, or SLDMB, used to evaluate surface currents in a body of water. Often employed by coastal search and rescue. 

  • A fixed reference point or set of reference points which precisely define a system of measurement or a coordinate system. 

verb
  • To provide missing data points by using a mathematical model to extrapolate values that are outside the range of a measuring device. 

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