Category, plural categories, may refer to:
Philosophy and general uses
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Categorization
Categorization is the ability and activity of recognizing shared features or similarities between the elements of the experience of the world (such as objects, events, or ideas), organizing and classifying experience by associating them to a ...
, categories in cognitive science, information science and generally
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Category of being In ontology, the theory of categories concerns itself with the ''categories of being'': the highest ''genera'' or ''kinds of entities'' according to Amie Thomasson. To investigate the categories of being, or simply categories, is to determine the m ...
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''Categories'' (Aristotle)
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Category (Kant)
In Immanuel Kant's philosophy, a category (german: Categorie in the original or ''Kategorie'' in modern German) is a pure concept of the understanding (''Verstand''). A Kantian category is a characteristic of the appearance of any object in ge ...
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Categories (Peirce)
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Category (Vaisheshika)
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Stoic categories
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Category mistake
Mathematics
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Category (mathematics)
In mathematics, a category (sometimes called an abstract category to distinguish it from a concrete category) is a collection of "objects" that are linked by "arrows". A category has two basic properties: the ability to compose the arrows ass ...
, a structure consisting of objects and arrows
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Category (topology)
In mathematics, a topological space X is said to be a Baire space if countable unions of closed sets with empty interior also have empty interior.
According to the Baire category theorem, compact Hausdorff spaces and complete metric spaces are e ...
, in the context of Baire spaces
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Lusternik–Schnirelmann category In mathematics, the Lyusternik–Schnirelmann category (or, Lusternik–Schnirelmann category, LS-category) of a topological space X is the homotopy invariant defined to be the smallest integer number k such that there is an open covering \_ of X ...
, sometimes called ''LS-category'' or simply ''category''
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Categorical data
In statistics, a categorical variable (also called qualitative variable) is a variable that can take on one of a limited, and usually fixed, number of possible values, assigning each individual or other unit of observation to a particular group or ...
, in statistics
Linguistics
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Lexical category
In grammar, a part of speech or part-of-speech (abbreviated as POS or PoS, also known as word class or grammatical category) is a category of words (or, more generally, of lexical items) that have similar grammatical properties. Words that are assi ...
, a part of speech such as ''noun'', ''preposition'', etc.
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Syntactic category A syntactic category is a syntactic unit that theories of syntax assume. Word classes, largely corresponding to traditional parts of speech (e.g. noun, verb, preposition, etc.), are syntactic categories. In phrase structure grammars, the ''phrasal c ...
, a similar concept which can also include phrasal categories
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Grammatical category
In linguistics, a grammatical category or grammatical feature is a property of items within the grammar of a language. Within each category there are two or more possible values (sometimes called grammemes), which are normally mutually exclusiv ...
, a grammatical feature such as ''tense'', ''gender'', etc.
Other
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Category (chess tournament)
A chess tournament is a series of chess games played competitively to determine a winning individual or team. Since the first international chess tournament in London, 1851, chess tournaments have become the standard form of chess competition amo ...
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Objective-C categories, a computer programming concept
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Pregnancy category
The pregnancy category of a medication is an assessment of the risk of fetal injury due to the pharmaceutical, if it is used as directed by the mother during pregnancy. It does ''not'' include any risks conferred by pharmaceutical agents or their ...
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Prisoner security categories in the United Kingdom
In the United Kingdom, prisoners are divided into four categories of security. Each adult is assigned a category, depending on the crime committed, the sentence, the risk of escape, and violent tendencies. The categories are single letters, in a ...
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Weight class (boxing)
In boxing, a weight class is a measurement weight range for boxers. The lower limit of a weight class is equal to the upper weight limit of the class below it. The top class, with no upper limit, is called heavyweight in professional boxing an ...
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List of software categories
Software categories are groups of software. They allow software to be understood in terms of those categories, instead of the particularities of each package. Different classification schemes consider different aspects of software.
Computer softwa ...
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Categories (word game)
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Saffir–Simpson hurricane wind scale, a common categorization of hurricane intensities
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Categories of New Testament manuscripts
* Network cable categories:
1,
2,
3,
4,
5/5e,
6/6a,
7/7a (F)
* A classification in a system of
compartmentalization (information security)
Compartmentalization or compartmentalisation may refer to:
* Compartmentalization (biology)
* Compartmentalization (engineering)
* Compartmentalization (fire protection)
* Compartmentalization (information security)
* Compartmentalization (psycho ...
See also
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Categorical (disambiguation)
Categorical may refer to:
* Categorical imperative, a concept in philosophy developed by Immanuel Kant
* Categorical theory, in mathematical logic
* Morley's categoricity theorem, a mathematical theorem in model theory
* Categorical data analysis ...
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Category 1 (disambiguation) Category 1 can refer to:
* Category 1 cable, an electrical standard for communications wiring
* Category 1 tropical cyclone, on any of the Tropical cyclone scales
* Cat11egory 1 pandemic, on the Pandemic Severity Index, an American influenza pand ...
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Category 2 (disambiguation) Category 2 or Category II may refer to:
* Category 2 cable, a grade of unshielded twisted pair cabling
* Category 2 tropical cyclone, on any of the Tropical cyclone scales
* Category 2 pandemic, on the Pandemic Severity Index, an American influen ...
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Category 3 (disambiguation) Category 3 or Category III can refer to:
* Category 3 cable, a specification for data cabling
* British firework classification
* Category 3 tropical cyclone, on any of the tropical cyclone scales
* Category 3 pandemic, on the Pandemic Severity I ...
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Category 4 (disambiguation) Category 4 or Category IV may refer to:
* Category 4 cable, a cable that consists of four unshielded twisted-pair wires
* Category 4 fireworks, British fireworks that are for sale only to professionals
* Category 4 tropical cyclone, on any of the ...
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Category 5 (disambiguation) Category 5 may refer to:
* ''Category 5'' (album), an album from rock band, FireHouse
*Category 5 cable, used for carrying data
* Category 5 computer virus, as classified by Symantec Corporation
* Category 5 Records, a record label
*Category 5 trop ...
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Category 6 (disambiguation) Category 6 or Category VI may refer to:
* '' Category 6: Day of Destruction'', a 2004 made-for-TV movie
* Category 6 cable
Category 6 cable (Cat 6) is a standardized twisted pair cable for Ethernet and other network physical layers tha ...
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Category 7: The End of the World
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Category A (disambiguation) Category A may refer to:
* Category A Listed building (Scotland)
* Category A Prison (UK)
* Category A Bioterrorism agent
* Category A services (Canada)
* A category of driving licence in the European Economic Area
* A category of driving licence ...
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Category B (disambiguation) Category B may refer to:
* Category B Listed buildings in Scotland, Listed building (Scotland)
* Category B Prison (UK)
* Category B Bioterrorism agent
* Category B services (Canadian television)
* A category of European driving licence#Categories ...
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Category C (disambiguation) Category C may refer to:
* Category C Listed building (Scotland)
* Category C Prison (UK)
* Category C Bioterrorism agent
* Pregnancy Category C
* Category C services (Canadian television)
* A category of driving licence in the European Economic ...
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