Origin: Germanic Old English prefix
Foreign has 7 different meanings across 1 category:
A foreign person
"The local festival welcomed visitors from many countries, including a friendly foreign person who shared stories about his hometown."
A foreigner: a person from another country.
"The foreigner sitting next to me on the train was trying to figure out how to use the subway map."
In plain English: A foreign thing is something that comes from another country and is not familiar to you.
"They had to deal with some unexpected foreign elements in their investment portfolio."
Usage: Foreign is an adjective describing something from another country and should not be used as a noun to refer to a person. Instead of saying "a foreign," use terms like "an immigrant," "a visitor," or simply "a foreigner."
of concern to or concerning the affairs of other nations (other than your own)
"foreign trade"
"a foreign office"
not belonging to that in which it is contained; introduced from an outside source
"water free of extraneous matter"
"foreign particles in milk"
Located outside a country or place, especially one's own.
"She felt uneasy eating food from foreign countries while traveling through Europe."
In plain English: Foreign means something that comes from or belongs to a different country than your own.
"She speaks a foreign language that many people in the office do not understand."
Usage: Use "foreign" to describe something originating from or existing outside your specific country or community. Avoid using it simply to mean unfamiliar or strange when referring to concepts within your own culture.
The word "foreign" comes from the Latin phrase forās, meaning "outside," and entered Middle English via Old French to describe outsiders. It eventually replaced native Old English words like elþēodiġ ("foreign") and became the standard term for anything not indigenous to a particular place.