# adjunction

> English word · Noun

## Definitions
1. The act of joining; the thing joined or added.
2. The joining of personal property owned by one to that owned by another.
3. The process of adjoining elements to an algebraic structure (usually a ring or field); the result of such a process.
4. A relationship between a pair of categories that makes the pair, in a weak sense, equivalent.
5. A natural isomorphism between a pair of functors satisfying certain conditions, whose existence implies a close relationship between the functors and between their (co)domains; the natural isomorphism, functors, and their (co)domains thought of as a single object.
6. A natural isomorphism between a pair of functors satisfying certain conditions, whose existence implies a close relationship between the functors and between their (co)domains; the natural isomorphism, functors, and their (co)domains thought of as a single object.

## Etymology
From Latin adjunctio, from adjungere: compare French adjonction, and see adjunct.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/adjunction