"Classification" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus, MeSH (Medical Subject Headings). Descriptors are arranged in a hierarchical structure, which enables searching at various levels of specificity.
MeSH information
The systematic arrangement of entities in any field into categories classes based on common characteristics such as properties, morphology, subject matter, etc.

This graph shows the total number of publications written about "Classification" by people in this website by year, and whether "Classification" was a major or minor topic of these publications.
Bar chart showing 835 publications over 29 distinct years, with a maximum of 61 publications in 2017
To see the data from this visualization as text, click here.