from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A limit that when passed or exceeded permits of no return and typically results in irrevocable commitment.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- proper n. An ancient Latin name for a small river in northern Italy which flows into the Adriatic Sea. It marked the boundary between the Roman province of Gaul and the Roman heartland. Its crossing by Julius Caesar in 49 BC began a civil war.
from the GNU version of the Collaborative International Dictionary of English
- n. A small river which separated Italy from Cisalpine Gaul, the province alloted to Julius Cæsar.
from The Century Dictionary and Cyclopedia
- To lurch. (See lurch, transitive verb) In rubicon piquet, when the loser's score does not reach 100 it is added to the winner's. In rubicon bezique, see the extract.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the boundary in ancient times between Italy and Gaul; Caesar's crossing it with his army in 49 BC was an act of war
- n. a line that when crossed permits of no return and typically results in irrevocable commitment
Latin Rubicō, Rubicōn-, Rubicon, a short river of north-central Italy, the crossing of which by Julius Caesar and his army in 49 B.C. began a civil war.(American Heritage® Dictionary of the English Language, Fourth Edition)