- The definition of a category is any sort of division or class.
An example of category is food that is made from grains.
These belong in the grain category.
- a class or division in a scheme of classification
- Logic any of the various basic concepts into which all knowledge can be classified
Origin of categoryLate Latin categoria ; from Classical Greek katēgoria ; from katēgorein, to accuse, assert, predicate ; from kata-, down, against + agoreuein, to declaim, address an assembly ; from agora, agora
- A specifically defined division in a system of classification; a class.
- A general class of ideas, terms, or things that mark divisions or coordinations within a conceptual scheme, especially:a. Aristotle's modes of objective being, such as quality, quantity, or relation, that are inherent in everything.b. Kant's modes of subjective understanding, such as singularity, universality, or particularity, that organize perceptions into knowledge.c. A basic logical type of philosophical conception in post-Kantian philosophy.
- Linguistics a. A property or structural unit of a language, such as a part of speech or a type of phrase.b. A specific grammatical defining property of a linguistic unit or class, such as number or gender in the noun and tense or voice in the verb.
- Mathematics A class of objects, together with a class of morphisms between those objects, and an associative composition rule for those morphisms. Categories are used to study a wide variety of mathematical constructions in a similar way.
Origin of categoryFrench catégorie, from Old French, from Late Latin catēgoria, class of predicables, from Greek katēgoriā, accusation, charge, from katēgorein, to accuse, predicate : kat-, kata-, down, against; see cata– + agoreuein, ēgor-, to speak in public (from agorā, marketplace, assembly; see ger- in Indo-European roots).
- A group, often named or numbered, to which items are assigned based on similarity or defined criteria.
- This steep and dangerous climb belongs to the most difficult category.
- I wouldn't put this book in the same category as the author's first novel.
- (mathematics) A collection of objects, together with a transitively closed collection of composable arrows between them, such that every object has an identity arrow, and such that arrow composition is associative.
- One well-known category has sets as objects and functions as arrows.
- Just as a monoid consists of an underlying set with a binary operation "on top of it" which is closed, associative and with an identity, a category consists of an underlying digraph with an arrow composition operation "on top of it" which is transitively closed, associative, and with an identity at each object. In fact, a category's composition operation, when restricted to a single one of its objects, turns that object's set of arrows (which would all be loops) into a monoid.
category - Computer Definition