- A person, animal, plant, or other thing which is from outside the family, group, organization, or territory under consideration.
- A foreigner residing in a country.
- 1773, William Blackstone, Commentaries on the laws of England: in four books, Volume 1 (Fifth Edition), page 372 An alien born may purchase lands, or other estates: but not for his own use; for the king is thereupon entitled to them.
- 1831, John Marshall, Cherokee Nation v. Georgia, U.S. Government The counsel have shown conclusively that they are not a state of the union, and have insisted that individually they are aliens, not owing allegiance to the United States.
- 2004, Wesley Campbell, Stephen Court, Be a hero: the battle for mercy and social justice, Destiny Image Publishers, page 74 Aliens are aliens because of persecution or war or hardship or famine.
- Any life form of extraterrestrial origin.
- One excluded from certain privileges; one alienated or estranged.
- Bible, Ephes. ii. 12 Aliens from the common wealth of Israel.
- space alien
- Pertaining to an alien.
- Not belonging to the same country, land, or government, or to the citizens or subjects thereof; foreign. alien subjects, enemies, property, or shores
- Very unfamiliar, strange, or removed. principles alien to our religion
- Wordsworth An alien sound of melancholy.
- (transitive) To estrange; to alienate.
- (legal) To transfer the ownership of something.
- aline, Aline, A-line, anile, laine, linea