Definitions of foreign:

• adjective:   relating to or originating in or characteristic of another place or part of the world

  Example: "Foreign nations"

• adjective:   of concern to or concerning the affairs of other nations (other than your own)

  Example: "Foreign trade"

• adjective:   not contained in or deriving from the essential nature of something

  Example: "The mysticism so foreign to the French mind and temper"

• adjective:   not belonging to that in which it is contained; introduced from an outside source

  Example: "Foreign particles in milk"