First Known Use: 1626
Dictionary
Rubicon
noun Ru·bi·con \ˈrü-bi-ˌkän\
Definition of RUBICON
: a bounding or limiting line; especially : one that when crossed commits a person irrevocably
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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
Rubicon
geographical name Ru·bi·con \ˈrü-bi-ˌkän\
Definition of RUBICON
river 15 miles (24 kilometers) N cen Italy flowing E into the Adriatic
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