Etymology
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foreign (adj.)

c. 1300, ferren, foran, foreyne, in reference to places, "outside the boundaries of a country;" of persons, "born in another country," from Old French forain "strange, foreign; outer, external, outdoor; remote, out-of-the-way" (12c.), from Medieval Latin foraneus "on the outside, exterior," from Latin foris (adv.) "outside," literally "out of doors," related to foris "a door" (from PIE *dhwor-ans-, suffixed form of root *dhwer- "door, doorway").

English spelling altered 17c., perhaps by influence of reign, sovereign. Sense of "alien to one's nature, not connected with, extraneous" attested late 14c. Meaning "pertaining to another country" (as in foreign policy) is from 1610s. Replaced native fremd. Related: Foreignness. Old English had ælþeodig, ælþeodisc "foreign," a compound of æl- "foreign" + þeod "people."

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Definitions of foreign

foreign (adj.)
of concern to or concerning the affairs of other nations (other than your own);
a foreign office
foreign trade
foreign (adj.)
relating to or originating in or characteristic of another place or part of the world;
on business in a foreign city
a foreign accent
foreign nations
Synonyms: strange
foreign (adj.)
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
Synonyms: alien
foreign (adj.)
not belonging to that in which it is contained; introduced from an outside source;
foreign particles in milk
Synonyms: extraneous
From wordnet.princeton.edu