Usually means: Not from this planet, foreign.
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We found 50 dictionaries that define the word alien:

General (27 matching dictionaries)
  1. alien: Merriam-Webster.com
  2. alien: Oxford Learner's Dictionaries
  3. alien: American Heritage Dictionary of the English Language
  4. alien: Collins English Dictionary
  5. alien: Vocabulary.com
  6. Alien, alien: Wordnik
  7. alien: Cambridge Advanced Learner's Dictionary
  8. alien: Wiktionary
  9. alien: Webster's New World College Dictionary, 4th Ed.
  10. alien: The Wordsmyth English Dictionary-Thesaurus
  11. alien: Infoplease Dictionary
  12. alien: Dictionary.com
  13. alien (adj.): Online Etymology Dictionary
  14. alien: Cambridge Essential American English Dictionary
  15. AliEn (ALICE Environment), Alien (Alien), Alien (Alien franchise), Alien (Atlanta Rhythm Section song), Alien (Britney Spears song), Alien (Northlane album), Alien (Pennywise song), Alien (Strapping Young Lad album), Alien (United States), Alien (band), Alien (biology), Alien (creature in Alien franchise), Alien (disambiguation), Alien (file converter), Alien (film), Alien (film franchise), Alien (film series), Alien (franchise), Alien (game), Alien (law), Alien (movie), Alien (sculpture), Alien (software), Alien (soundtrack), Alien (video game), Alien, The Alien (Animorphs), The Alien (novel), The Alien (unproduced film), The Alien (unreleased film): Wikipedia, the Free Encyclopedia
  16. Alien: Online Plain Text English Dictionary
  17. alien: Webster's Revised Unabridged, 1913 Edition
  18. alien: Rhymezone
  19. alien: AllWords.com Multi-Lingual Dictionary
  20. alien: Webster's 1828 Dictionary
  21. alien: Free Dictionary
  22. alien: Mnemonic Dictionary
  23. alien: Wikimedia Commons US English Pronunciations
  24. alien: Dictionary/thesaurus
  25. alien: Merriam-Webster.com

Business (13 matching dictionaries)
  1. alien: Webster's New World Law Dictionary
  2. Duhaime's Canadian law dictionary (No longer online)
  3. alien: Law.com Dictionary
  4. Everybody's Legal Dictionary (No longer online)
  5. THE 'LECTRIC LAW LIBRARY'S REFERENCE ROOM (No longer online)
  6. Glossary of Legal Terms (No longer online)
  7. Alien: A DICTIONARY OF LAW (1893)
  8. MSN Money (No longer online)
  9. Bouvier's Law Dictionary 1856 Edition (No longer online)
  10. Alien: Investopedia
  11. alien: Legal dictionary
  12. Alien (law), Alien: Financial dictionary
  13. BusinessDictionary.com (No longer online)

Computing (1 matching dictionary)
  1. alien: Encyclopedia

Miscellaneous (4 matching dictionaries)
  1. Political (No longer online)
  2. alien: Genealogy Glossary
  3. ALIEN: Acronym Finder
  4. AbbreviationZ (No longer online)

Religion (1 matching dictionary)
  1. Alien: Easton Bible

Science (2 matching dictionaries)
  1. Botanical Terms (No longer online)
  2. alien: Evolution Glossary

Slang (1 matching dictionary)
  1. The Alien: Urban Dictionary

Sports (1 matching dictionary)
  1. 2060 Shadow-Slang (No longer online)

(Note: See aliening as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  A person, animal, plant, or other thing which is from outside the family, group, organization, or territory under consideration.
noun:  (sometimes derogatory) A person in a country not their own.
noun:  Any life form of extraterrestrial or extradimensional origin.
noun:  One excluded from certain privileges; one alienated or estranged.
adjective:  Not belonging to the same country, land, or government, or to the citizens or subjects thereof; foreign.
adjective:  Very unfamiliar, strange, or removed.
adjective:  Pertaining to extraterrestrial life; typical of an extraterrestrial creature.
verb:  (transitive) To estrange; to alienate.
verb:  (law) To transfer the ownership of something.
noun:  Alternative form of Alian [A district of Kaohsiung, Taiwan.]

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