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alien  (aliens plural )
1  adj Alien means belonging to a different country, race, or group, usually one you do not like or are frightened of. 
FORMAL usu ADJ n  (disapproval)   (=foreign) 
He said they were opposed to the presence of alien forces in the region.  
2  adj You use alien to describe something that seems strange and perhaps frightening, because it is not part of your normal experience. 
usu ADJ n  (=unfamiliar) 
His work offers an insight into an alien culture.  
3  adj If something is alien to  you or  to  your normal feelings or behaviour, it is not the way you would normally feel or behave. 
FORMAL v-link ADJ to n  (=foreign, unfamiliar) 
Such an attitude is alien to most businessmen.  
4  n-count An alien is someone who is not a legal citizen of the country in which they live. 
FORMAL or, LEGAL  (=foreigner) 
5  n-count In science fiction, an alien is a creature from outer space.