adjoin

verb

ad·​join ə-ˈjȯin 

a-

adjoined; adjoining; adjoins

transitive verb

1

: to add or attach by joining

2

: to lie next to or in contact with

intransitive verb

: to be close to or in contact with one another

Synonyms of adjoin

• join
• flank
• surround
• neighbor
• touch

Examples of adjoin in a Sentence

Her office adjoins the library.

The two rooms adjoin each other.

Recent Examples on the Web

In a Reddit thread discussing adjoining rooms on cruises, one user described constant disruptions from neighboring guests. —Kelly McGreal, FOXNews.com, 30 Mar. 2026

The adjoining family room seamlessly connects the kitchen and breakfast area, creating a comfortable gathering space. —Judi Wright, Dallas Morning News, 29 Mar. 2026

In the bathroom that adjoins the home gym, a soft-pink marble steals the show. —Kathryn O’Shea-Evans, Robb Report, 29 Mar. 2026

Book Early, Especially for Families Family-friendly accommodations like adjoining rooms, suites, and vacation rentals sell out faster than standard rooms. —Lauren Schuster, Kansas City Star, 25 Mar. 2026

Word History

Etymology

Middle English ajoynen, adjoynen, borrowed from Anglo-French ajoindre, going back to Latin adjungere "to link up, yoke, add, attach," from ad- ad- + jungere "to join entry 1"

First Known Use

14th century, in the meaning defined at transitive sense 1

Rhymes for adjoin

• benzoin
• bitcoin
• conjoin
• enjoin
• fibroin
• rejoin
• sirloin
• subjoin
• coin
• coyne
• groin
• join

Kids Definition

adjoin

verb

ad·​join ə-ˈjȯin 

a-

1

: to add or attach by joining

2

: to lie next to or in contact with