taxonomy

noun3

1. •
   The science, technique, or process used to make a classification.
2. •
   A classification; especially, a classification in a hierarchical system.

   • At the petabyte scale, information is not a matter of simple three- and four-dimensional taxonomy and order but of dimensionally agnostic statistics. — 2008
3. •
   The science of finding, describing, classifying and naming organisms.