conjecture vs datum

conjecture

noun
  • A supposition based upon incomplete evidence; a hypothesis. 

  • A statement or an idea which is unproven, but is thought to be true; a guess. 

  • A statement likely to be true based on available evidence, but which has not been formally proven. 

verb
  • To infer on slight evidence; to guess at. 

  • To guess; to venture an unproven idea. 

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. 

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