assessing vs mensuration

assessing

noun
  • Action of the verb to assess; assessment. 

mensuration

noun
  • The act or process of measuring; measurement. 

  • A 13th century system for governing rhythmic relationships in music that was a precursor to the modern use of time signatures; The use of mensural notation. 

  • The study of measurement, especially the derivation and use of algebraic formulae to measure the areas, volumes and different parameters of geometric figures. 

  • The use of quantitative measurements of forest stand to determine stand timber volume, productivity, and health. 

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