Alien | Mean of alien in English Dictionary

/ˈeɪlijən/

• not familiar or like other things you have known
1. She felt lost in an alien [=strange] culture when she moved to the city.
2. an alien environment
3. Honesty seems to be an alien concept in that family. [=people in that family are not honest]
4. The whole idea of having a job was alien [=unfamiliar, foreign] to him.
• from another country
1. alien residents
• too different from something to be acceptable or suitable
1. Such behavior is totally alien to the spirit of the religion.
2. ideas alien to [=incompatible with] democracy

• from somewhere other than the planet Earth
1. an alien spaceship
2. The movie is a story about an attack on Earth by an army of alien [=extraterrestrial] monsters.
• Noun
• a person who was born in a different country and is not a citizen of the country in which he or she now lives
1. aliens seeking asylum in the U.S.
2. illegal aliens [=foreign people who live in a country without having official permission to live there]
• a creature that comes from somewhere other than the planet Earth
1. The movie is about an invasion by aliens. [=extraterrestrials]
2. He claims that he was captured by space aliens.