/ˈālēən/

adjective

adjective: alien

1. belonging to a foreign country or nation.

   synonyms: foreign, overseas, nonnative, external, distant, remote

   antonyms: native

noun

noun: alien plural noun: aliens

1. a foreigner, especially one who is not a naturalized citizen of the country where they are living.: "an illegal alien".

   synonyms: foreigner, foreign national, nonnative, immigrant, emigrant, émigré, incomer, newcomer, visitor, outsider, stranger

   antonyms: native