adjoin adjoin /əˈdʒɔɪn/

verb

1. () Lie adjacent to another or share a boundary  ( abut , border , butt on , adjoin , butt , butt against , edge , march )
   lie adjacent to another or share a boundary
    Canada adjoins the U.S.
   Canada adjoins the U.S.
    England marches with Scotland
   England marches with Scotland
   
2. Attach or add  ( adjoin )
   attach or add
    I adjoin a copy of your my lawyer's letter
   I adjoin a copy of your my lawyer's letter
   
3. Be in direct physical contact with; make contact  ( adjoin , contact , meet , touch )
   be in direct physical contact with; make contact
    The two buildings touch
   The two buildings touch
    Their hands touched
   Their hands touched
    The wire must not contact the metal cover
   The wire must not contact the metal cover
    The surfaces contact at this point
   The surfaces contact at this point