Complementing and Adjoin

verb

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

• (v.t.) To join or unite to; to lie contiguous to; to be in contact with; to attach; to append.
• (v.i.) To lie or be next or in contact; to be contiguous; as, the houses adjoin.
• (v.i.) To join one's self.