Adjoining means sharing a wall or a border with the next one. An adjoining room, the adjoining property, adjoining land.
It is estate agent and legal language, and it means touching rather than merely near — an adjoining room shares a wall, and an adjacent one need only be beside it. In property disputes the distinction decides who pays for the fence.
1adjectiveadjoiningSharing a wall or a border with the next one.
“We booked adjoining rooms so the kids could sleep next door to us.”
adjoining is a relation.
Old French ajoindre comes from Latin adiungere, to join to — ad plus iungere, to join.
Latin
adiungō — join to
Old French
ajoindre
Middle English
ajoinen
English, today
adjoining
Built from
From Middle English ajoinen, from Old French ajoindre, (compare French adjoindre), from Latin adiungō (“join to”), formed from ad- (“to, towards, at”) + iungō (“join”).
Etymology from Wiktionary, CC BY-SA