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

Coca cultivation has spread from remote mountainous areas into Peru’s lowlands, a huge stretch of land adjoining Brazil and Colombia, where new variants thrive. —Tim Lister, CNN Money, 22 Nov. 2025

The event took place in the White House East Room, a space that will one day adjoin the new $300 million ballroom, and was arranged to recognize donors who privately funded construction that's now underway. —Arden Farhi, CBS News, 19 Nov. 2025

This formal living room adjoins a dining area so the space can accommodate a large gathering. —Leanne Potts, Better Homes & Gardens, 9 Nov. 2025

Ladd, Laura and Bruce also all have adjoining stars on the Hollywood Walk of Fame. —Lynsey Eidell, PEOPLE, 3 Nov. 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