Being in contact at some point or line; joining to; contiguous; bordering: an adjoining room.
present participle of adjoin.
Noun Verb Adjective Adverb Other
From Middle English ajoinen, from Old French ajoindre, (compare French adjoindre), from Latin adiungō (“join to”), formed from ad- (“to, towards, at”) + iungō (“join”).
- Wiktionary :adjoining (CC BY-SA 3.0)