On Wikipedia, categories are used to organize the entire project. To learn about how this works, see Help:Category and Wikipedia:FAQ/Categorization.
For an overview of categorization guidelines, see Wikipedia:Categorization. To browse the existing categories, see Portal:Contents/Categorical index.

Category may refer to:

In taxonomic uses:

In computer programming:

In Metaphysics (in particular Ontology) the different kinds or ways of Being are called categories of being or simply categories Taxonomic rank ( rank, category, taxonomic category is an abstract term used in the Scientific classification, or Taxonomy, of organisms In Mathematics, a category is a fundamental and abstract way to describe mathematical entities and their relationships Categories ( Lat Categoriae, Greek Κατηγορίαι Katēgoriai) is a text from Aristotle 's Organon that In Kant 's philosophy a category is a pure concept of the understanding The term Stoic Categories refers to Stoic ideas regarding Categories: the most fundamental classes of being for all things Categories is a Word game in which players think of words that begin with specified letters and belong to specified semantic categories In Mathematics, a Baire space is a Topological space which intuitively speaking is very large and has "enough" points for certain limit processes In Mathematics, a Baire space is a Topological space which intuitively speaking is very large and has "enough" points for certain limit processes In Mathematics, the Lyusternik–Schnirelmann category (or Lusternik–Schnirelmann category, LS-category, or simply category) of a Topological The pregnancy category of a pharmaceutical agent is an assessment of the risk of fetal injury due to the pharmaceutical if it is used as directed by the mother during There are four prison security categories in the United Kingdom used to classify every adult prisoner for the purposes of assigning them to a prison Boxing weight -class names are not always consistent as shown in the following table See also Boxing List of current Objective-C is a reflective, object-oriented Programming language which adds Smalltalk -style messaging to C. Categorization is the process in which ideas and objects are recognized, differentiated and understood.

## category

### -noun

1. A group, often named or numbered, to which items are assigned based on similarity or defined criteria.
2. (mathematics) A collection of objects, together with a transitively closed collection of composable arrows between them, such that every object has an identity arrow.
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