1. [adjective] Located outside a country or place, especially one's own.
2. [adjective] Originating from, characteristic of, belonging to, or being a citizen of a country or place other than the one under discussion.
3. [adjective] Relating to a different nation.
4. [adjective] Not characteristic of or naturally taken in by an organism or system.
5. [adjective] (with to) (formerly with from) Alien; strange.
6. [adjective] (obsolete) Held at a distance; excluded; exiled.
7. [adjective] (US) (state legal) From a different one of the states of the United States, as of a state of residence or incorporation.
8. [adjective] Belonging to a different organization, company etc.
9. [noun] (informal) foreigner
10. [adjective] Of concern to or concerning the affairs of other nations (other than your own); 'foreign trade'; 'a foreign office'.
11. [adjective] Relating to or originating in or characteristic of another place or part of the world; 'foreign nations'; 'a foreign accent'; 'on business in a foreign city'.
12. [adjective] Not contained in or deriving from the essential nature of something; 'an economic theory alien to the spirit of capitalism'; 'the mysticism so foreign to the French mind and temper'; 'jealousy is foreign to her nature'.
13. [adjective] Not belonging to that in which it is contained; introduced from an outside source; 'water free of extraneous matter'; 'foreign particles in milk'.