1. Relating to or originating in or characteristic of another place or part of the world
   "a foreign accent"; "on business in a foreign city"; "foreign nations";
   - strange
    
2. Of concern to or concerning the affairs of other nations (other than your own)
   "foreign trade"; "a foreign office"
    
3. Not contained in or deriving from the essential nature of something
   "the mysticism so foreign to the French mind and temper"; "jealousy is foreign to her nature";
   - alien
    
4. Not belonging to that in which it is contained; introduced from an outside source
   "foreign particles in milk";
   - extraneous

See also: abroad, adulterant, adulterating, adventive, alien, curiousness, established, exotic, external, extrinsic, foreign-born, foreignness, imported, international, naturalised [Brit], naturalized, nonnative, non-native, outside, overseas, strangeness, tramontane, unfamiliarity, unnaturalised [Brit], unnaturalized

Antonym: domestic, native

Encyclopedia: Foreign, Commonwealth and Development Secretary