/ əˈdʒɔɪn; NAmE / verb
( formal ) to be next to or joined to sth :
[ vn ]
A barn adjoins the farmhouse.
[also v ]
► ad·join·ing adjective [ usually before noun ]:
They stayed in adjoining rooms.
We'll have more space if we knock down the adjoining wall (= the wall between two rooms) .
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WORD ORIGIN
Middle English : from Old French ajoindre , from Latin adjungere , from ad- to + jungere to join.