Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Old French
Origin: Latin alienus, from alius 'other'

alien

1 adjective
     
Related topics: Space
a‧li‧en1
1 very different from what you are used to, especially in a way that is difficult to understand or accept [= strange]:
the alien environment of the city
be alien to somebody
a way of life that is totally alien to us
2 belonging to another country or race [= foreign]:
alien cultures
an alien multiracial society
3 [only before noun]TTS relating to creatures from another world:
alien beings from another planet

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