1
- belonging to a foreign country or nation外国的, 异族的。
1.1
- unfamiliar and disturbing or distasteful陌生（而令人烦扰或讨厌）的：
principles that are alien to them.
对他们来说的陌生原则。
1.2
- relating to or denoting beings supposedly from other worlds; extraterrestrial与外星人有关的; 与地球外有关的：
an alien spacecraft.
一个外星飞行器。
1.3
- (of a plant or animal species) introduced from another country and later naturalized（植物或动物种类）外来的。
1
- a foreigner, especially one who is not a naturalized citizen of the country where he or she is living外国人（尤指非本地公民）, 外侨：
an enemy alien.
一个外族敌人。
1.1
- a hypothetical or fictional being from another world外星人。
1.2
- a plant or animal species originally introduced from another country and later naturalized（植物、动物种类的）外国引进品种。
派生词
alienness
noun词源
Middle English: via Old French from Latin alienus 'belonging to another'， from alius 'other'.