datum vs summary

datum

noun
  • 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. 

  • A fact known from direct observation. 

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

summary

noun
  • An abstract or a condensed presentation of the substance of a body of material. 

adj
  • Performed speedily and without formal ceremony. 

  • Concise, brief or presented in a condensed form 

  • Performed by skipping the procedures of a standard and fair trial. 

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