Search Dictionary
Definition of rubicon

rubicon

/ˈruː.bəˌkɑːn/
ru · bi · con

Plural:rubicons
JUMP TO:

rubicon Lexical Profile

rubicon Game Scores & Validity

• noun

1

A bounding or limiting line; a point of no return where crossing it irrevocably commits a person to a specific course of action.

Example

"By resigning from the board in public protest, she knew she had crossed a rubicon in her professional career."


2

A small river in northeastern Italy that historically formed the boundary between Roman Italy and Cisalpine Gaul.

Synonyms
View all synonyms for rubicon

Word Nuance & Usage

Most commonly encountered in the idiom 'cross the Rubicon', and frequently capitalized even when used metaphorically as a common noun to denote a point of no return.

Word Origin & Etymology

From Latin 'Rubico' (stem 'Rubicon-'), a small river in northern Italy. In 49 BC, Julius Caesar led his army across the river, violating Roman law and making civil war inevitable.

Usage Trend

Historical frequency of usage in published text.

180019102020

Cite this Entry


Wordmom. (2026). Definition of Rubicon. In Wordmom Dictionary. Retrieved Oct 19, 2026, from https://wordmom.com/dictionary/rubicon
Built for writers, students, and competitive word game players, Wordmom combines an uncluttered English dictionary and thesaurus with fast, pattern-based word finders so you can verify definitions, synonyms, and high-scoring tile plays in one place.
Dictionary & Reference
© 2016–2026 Wordmom Network. All rights reserved. Made with for word lovers everywhere.
Disclaimer: SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A. and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro. Words With Friends® is a registered trademark of Zynga Inc. Wordle® is a registered trademark of The New York Times Company. Other referenced game titles and tournament lexicon codes (including NASPA NWL and WESPA/HarperCollins CSW) are trademarks of their respective owners. Wordmom is an independent reference utility for educational and entertainment purposes and is not affiliated with, sponsored by, or endorsed by Hasbro, Mattel, Spear, Zynga, The New York Times Company, NASPA, WESPA, or HarperCollins Publishers. All game names are referenced strictly under nominative fair use to indicate compatibility.