mensuration

1. The act or process of measuring; measurement.
2. (mathematics) The study of measurement, especially the derivation and use of algebraic formulae to measure the areas, volumes and different parameters of geometric figures.
   • 1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, New York, N.Y.: Columbia University Press, →ISBN, page ix:

     With the passage of time I have realized that the illustrations can also serve, to some extent, to make mensuration more readily possible.

3. (music) 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.
4. (forestry) The use of quantitative measurements of forest stand to determine stand timber volume, productivity, and health.

• mensural