'adjoin' definitions:

Definition of 'adjoin'

From: WordNet
verb
Lie adjacent to another or share a boundary; "Canada adjoins the U.S."; "England marches with Scotland" [syn: border, adjoin, edge, abut, march, butt, butt against, butt on]
verb
Be in direct physical contact with; make contact; "The two buildings touch"; "Their hands touched"; "The wire must not contact the metal cover"; "The surfaces contact at this point" [syn: touch, adjoin, meet, contact]
verb
Attach or add; "I adjoin a copy of your my lawyer's letter"

Synonyms of 'adjoin'

From: Moby Thesaurus