Definitions of attached:

• adjective:   associated in an exclusive sexual relationship
• adjective:   used of buildings joined by common sidewalls

  Example: "A block of attached houses"

• adjective:   fastened together

  Example: "A picnic table with attached benches"

• adjective:   being joined in close association

  Example: "All art schools whether independent or attached to universities"

• adjective:   permanently attached to a substrate; not free to move about

  Example: "An attached oyster"