• IPA: /ˈeɪ.li.ən/

alien (plural aliens)

  1. A person, animal, plant, or other thing which is from outside the family, group, organization, or territory under consideration.
  2. A foreigner residing in a country.
  3. Any life form of extraterrestrial or extradimensional origin.
  4. One excluded from certain privileges; one alienated or estranged.
    • Bible, Ephes. ii. 12
      Aliens from the common wealth of Israel.
Synonyms Related terms

Translations Translations Translations Adjective


  1. Not belonging to the same country, land, or government, or to the citizens or subjects thereof; foreign.
    alien subjects, enemies, property, or shores
  2. Very unfamiliar, strange, or removed.
    principles alien to our religion
  3. Pertaining to extraterrestrial life.
Translations Translations Translations Verb

alien (aliens, present participle aliening; past and past participle aliened)

  1. (transitive) To estrange; to alienate.
  2. (law) To transfer the ownership of something.

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