The meaning of ALIEN is belonging or relating to another person, place, or thing : strange. How to use alien in a sentence. Usage of Alien: Usage Guide Synonym Discussion of Alien.

/ ˈeɪ·li·ən / coming from a different country, race, or group; foreign: alien customs (Definition of alien from the Cambridge Academic Content Dictionary © Cambridge University Press)

ALIEN definition: a creature from outer space; extraterrestrial. See examples of alien used in a sentence.

1. a foreign-born resident who has not been naturalized and who owes allegiance to another country. 2. a foreigner. 3. a person who has been estranged or excluded. 4. an extraterrestrial.

Alien means belonging to a different country, race, or group, usually one you do not like or are frightened of. He said they were opposed to the presence of alien forces in the region. You use alien to …

Something that's alien is different or foreign. In science fiction, space aliens come from other planets. When we talk about aliens, or things that are alien, we're talking about things and people that are …

What does the word alien mean? There are 15 meanings listed in OED's entry for the word alien. See ‘Meaning & use’ for definitions, usage, and quotation evidence. How common is the word alien? …

Feb 3, 2026 · alien (plural aliens) A person, animal, plant, or other thing which is from outside the family, group, organization, or territory under consideration. quotations

Extraterrestrial: "Alien" is widely recognized in popular culture as a term for beings from other planets or galaxies. This usage has been sensationalized in movies, literature, and folklore, often depicting …

Definition of alien noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.