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say it: ROO-bi-kawn
rubicon is a noun meaning "the boundary in ancient times between Italy and Gaul; Caesar's crossing it with his army in 49 BC was an act of war". It is pronounced /ˈɹubɪkɔn/ — ROO-bi-kawn. It carries 2 recorded senses.
the boundary in ancient times between Italy and Gaul; Caesar's crossing it with his army in 49 BC was an act of war
a line that when crossed permits of no return and typically results in irrevocable commitment
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for rubicon come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.