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

But the town adjoining the base, Delta Junction, is small (with a 2020 population of 918) and has only a handful of food stores and restaurants. —Davis Winkie, USA Today, 8 Jan. 2026

Both intend to make new stadiums the striking centrepiece of wider developments, adjoined to large fan zones and commercial opportunities. —Philip Buckingham, New York Times, 5 Jan. 2026

The new building Musk posted about is in nearby Southaven, Mississippi, and adjoins the Colossus 2 facility, the Information reported earlier Tuesday, citing property records and a person familiar with the project. —Bloomberg, Mercury News, 31 Dec. 2025

Members can also take advantage of the family program and book adjoining rooms at half price. —Caitlin Gunther, Travel + Leisure, 25 Dec. 2025

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