Usually means: Unit of astronomical distance measurement.
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We found 32 dictionaries that define the word parsec:

General (17 matching dictionaries)
  1. parsec: Merriam-Webster
  2. parsec: Oxford Learner's Dictionaries
  3. parsec: American Heritage Dictionary of the English Language
  4. parsec: Collins English Dictionary
  5. parsec: Vocabulary.com
  6. Parsec, parsec: Wordnik
  7. parsec: Wiktionary
  8. parsec: Webster's New World College Dictionary, 4th Ed.
  9. parsec: The Wordsmyth English Dictionary-Thesaurus
  10. parsec: Infoplease Dictionary
  11. parsec: Dictionary.com
  12. parsec: Online Etymology Dictionary
  13. PARSEC, Parsec (disambiguation), Parsec (parser), Parsec (software), Parsec (video game), Parsec: Wikipedia, the Free Encyclopedia
  14. parsec: Rhymezone
  15. parsec: FreeDictionary.org
  16. parsec: Mnemonic Dictionary
  17. parsec: TheFreeDictionary.com

Computing (2 matching dictionaries)
  1. PARSEC: Free On-line Dictionary of Computing
  2. parsec: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Miscellaneous (1 matching dictionary)
  1. PARSEC: Acronym Finder

Science (7 matching dictionaries)
  1. From Stargazers to Starships Glossary (No longer online)
  2. Parsec: Eric Weisstein's World of Astronomy
  3. Imagine the Universe! Dictionary (No longer online)
  4. Parsec: Extragalactic Astronomy
  5. parsec: Nine Planets Glossary
  6. How Many? A Dictionary of Units of Measurement (No longer online)
  7. PARSEC: Zoom Astronomy Glossary

Slang (1 matching dictionary)
  1. parsec: Urban Dictionary

Tech (3 matching dictionaries)
  1. High-Energy Astrophysics (No longer online)
  2. Explosives (No longer online)
  3. JPL Terms (No longer online)

(Note: See parsecs as well.)

Definitions from Wiktionary (Parsec)

noun:  (astronomy, metrology) Short for parallax second. [A unit of length, used in astronomy, defined as the distance from the Earth of an object that exhibits a parallax of 1 arcsecond. It is approximately equal to 3.08568025 × 10¹³ kilometers or 3.2616 light years.]

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