datum vs narration

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. 

narration

noun
  • That part of an oration in which the speaker makes his or her statement of facts. 

  • That which is narrated or recounted; an orderly recital of the details and particulars of some transaction or event, or of a series of transactions or events; a story or narrative. 

  • The act of recounting or relating in order the particulars of some action, occurrence, or affair; a narrating. 

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