Usually means: Point of no return crossed.
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We found 27 dictionaries that define the word rubicon:

General (21 matching dictionaries)
  1. Rubicon, Rubicon, the Rubicon, the rubicon: Merriam-Webster.com
  2. Rubicon, rubicon: Oxford Learner's Dictionaries
  3. Rubicon: American Heritage Dictionary of the English Language
  4. Rubicon: Collins English Dictionary
  5. Rubicon: Vocabulary.com
  6. Rubicon, rubicon: Wordnik
  7. Rubicon, rubicon: Cambridge Advanced Learner's Dictionary
  8. Rubicon, rubicon: Wiktionary
  9. Rubicon: Webster's New World College Dictionary, 4th Ed.
  10. Rubicon: Infoplease Dictionary
  11. Rubicon: Dictionary.com
  12. Rubicon: Online Etymology Dictionary
  13. Rubicon (Belgium), Rubicon (English band), Rubicon (Rubicon album), Rubicon (TV series), Rubicon (The Duggans album), Rubicon (Tristania album), Rubicon (US band), Rubicon (band), Rubicon (disambiguation), Rubicon, The Rubicon: Wikipedia, the Free Encyclopedia
  14. Rubicon: Online Plain Text English Dictionary
  15. rubicon: Webster's Revised Unabridged, 1913 Edition
  16. Rubicon: Rhymezone
  17. Rubicon: AllWords.com Multi-Lingual Dictionary
  18. rubicon: Free Dictionary
  19. rubicon: Mnemonic Dictionary
  20. Rubicon: Dictionary/thesaurus
  21. Rubicon: Dictionary of Phrase and Fable (1898)

Computing (1 matching dictionary)
  1. Rubicon: Encyclopedia

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

Miscellaneous (3 matching dictionaries)
  1. Rubicon, rubicon: A Word A Day
  2. Rubicon: Idioms
  3. rubicon: Wordcraft Dictionary

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

(Note: See rubiconing as well.)

Definitions from Wiktionary (Rubicon)

noun:  (historical) A small river in northeastern Italy which flowed into the Adriatic Sea marking the boundary between the Roman province of Gaul and the Roman heartland. Its crossing by Julius Caesar in 49 B.C.E. began a civil war.
noun:  The same river in the present day, identified with a river previously named Fiumicino.
noun:  A limit that when surpassed cannot be returned from, or an action that when taken cannot be reversed.
noun:  (card games) Especially in bezique and piquet: a score which, if not achieved by a losing player, increases the player's penalty.
verb:  (transitive, card games) Especially in bezique and piquet: to defeat a player who has not achieved the rubicon.
noun:  Alternative letter-case form of rubicon (“a limit that when exceeded, or an action that when taken, cannot be reversed; especially in bezique and piquet: a score which, if not achieved by a losing player, increases the player's penalty”) [A limit that when surpassed cannot be returned from, or an action that when taken cannot be reversed.]

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Colors:
    crimson,     scarlet,     burgundy,     maroon,     ruby, more...



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