category
A group, often named or numbered, to which items are assigned based on similarity or defined criteria.
Example
“This steep and dangerous climb belongs to the most difficult category.”
Other meanings
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.”
Example sentences
Word history
From Ancient Greek "κατηγορία" (head of predicables).
Where this comes from
This definition is adapted from “category” on Wiktionary, by its contributors; example sentences are from Tatoeba, credited to their authors above, published under CC BY-SA 4.0. This page is published under the same licence.