Etymology

Noun

1. 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.

2. A collection of objects, together with a transitively closed collection of composable arrows between them, such that every object has an identity arrow.

   One well-known category has sets as objects and functions as arrows.

Synonyms

• See also Wikisaurus:class

Related terms

• categorical

• categorise / categorize

• categorial