category (noun, pl. categories) – a class or set of things, people, concepts, etc. that share one or several features (qualities, characters, etc.), a division in a system of classification. Thus in biological classification the taxa are categories of organisms, but also are the taxonomic ranks (class, order, family or species) categories of the biological nomenclature. Furthermore, informal groups such as tree, shrub, herb, or crustose, foliose, and fruticose categories. If these qualities are deemed characteristic or typical for that particular category, the term type is often used instead of category; see, e. g., spore types or ascus types.
In this glossary several all Categories have been defined to provide categorized access to the glossary terms.