Usually means: Nearest star system to Earth.
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We found 19 dictionaries that define the word Alpha Centauri:

General (15 matching dictionaries)
  1. Alpha Centauri: Merriam-Webster
  2. Alpha Centauri: Oxford Learner's Dictionaries
  3. Alpha Centauri: American Heritage Dictionary of the English Language
  4. Alpha Centauri: Collins English Dictionary
  5. Alpha Centauri: Vocabulary.com
  6. Alpha Centauri: Wiktionary
  7. Alpha Centauri: The Wordsmyth English Dictionary-Thesaurus
  8. Alpha Centauri: Infoplease Dictionary
  9. Alpha Centauri: Dictionary.com
  10. Alpha-Centauri, Alpha Centauri (Doctor Who), Alpha Centauri (album), Alpha Centauri (disambiguation), Alpha Centauri (horse), Alpha Centauri, Alpha centauri (Game), Alpha centauri: Wikipedia, the Free Encyclopedia
  11. Alpha centauri: Rhymezone
  12. alpha centauri: FreeDictionary.org
  13. alpha centauri: Mnemonic Dictionary
  14. Alpha Centauri: TheFreeDictionary.com
  15. Alpha Centauri: Merriam-Webster

Computing (1 matching dictionary)
  1. Alpha Centauri: Encyclopedia

Science (2 matching dictionaries)
  1. Alpha Centauri: Extragalactic Astronomy
  2. ALPHA CENTAURI: Zoom Astronomy Glossary

Slang (1 matching dictionary)
  1. alpha centauri: Urban Dictionary

Definitions from Wiktionary (Alpha Centauri)

noun:  (astronomy) The brightest star in the southern constellation of Centaurus. It is actually a binary star with Proxima Centauri as a third component.

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