# adjoin

> English word · Verb · IPA /əˈd͡ʒɔɪn/ · frequency rank #97,763

## Definitions
1. To be in contact or connection with.
2. To extend an algebraic object (e.g. a field, a ring, etc.) by adding to it an element not belonging to it and then ensuring closure, for example by also adding all finite power series of the element.

## Etymology
From Anglo-Norman adjoindre, from Latin adiungō.

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