Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

Rubicon

play
noun Ru·bi·con \ˈrü-bi-ˌkän\

Definition of Rubicon

  1. :  a bounding or limiting line; especially :  one that when crossed commits a person irrevocably



Origin of rubicon

Latin Rubicon-, Rubico, river of northern Italy forming part of the boundary between Cisalpine Gaul and Italy whose crossing by Julius Caesar in 49 b.c. was regarded by the Senate as an act of war


First Known Use: 1626


Rubicon

play
geographical name Ru·bi·con \ˈrü-bi-ˌkän\

Definition of Rubicon

  1. river 15 miles (24 kilometers) N cen Italy flowing E into the Adriatic





Learn More about rubicon


Seen and Heard

What made you want to look up Rubicon? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

February 10, 2016

to put in good humor

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image1037863653

Which of the following refers to thin, bending ice, or to the act of running over such ice?

pince-nez spindrift kittly-benders duvet
Name That Thing

10 quick questions: hear them, spell them, and see how your skills compare to the crowd.

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ