Breadcrumb Home > Thesaurus > R Synonyms of rubicon Find synonyms for: Noun 1. Rubicon usage: the boundary in ancient times between Italy and Gaul; Caesar's crossing it with his army in 49 BC was an act of war 2. Rubicon, point of no return, line, dividing line, demarcation, contrast usage: a line that when crossed permits of no return and typically results in irrevocable commitment WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of rubicon (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: hagiography Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language