Read the dictionary definition of adjoin. All definitions for this word.
1. attach or add
1. I adjoin a copy of your my lawyer's letter
2. be in direct physical contact with; make contact
1. The two buildings touch
2. Their hands touched
3. The wire must not contact the metal cover
4. The surfaces contact at this point
3. lie adjacent to another or share a boundary
1. Canada adjoins the U.S.
2. England marches with Scotland