Definitions:

1. to attach or add verb
   • I adjoin a copy of your my lawyer's letter.
2. to be in direct contact with adjective
   • The two adjoining rooms cost two thirds the price of two separate rooms.
3. to be in direct physical contact with verb
   • The two bedrooms adjoin.
4. to lie adjacent to another or share a boundary verb
   • Canada adjoins the U.S.

Synonyms:

• contact
• march