# Rubicon

> English word · Proper noun · IPA /ˈɹuːbɪkɒn/ · frequency rank #41,361

## Definitions
1. A small river in northeastern Italy which flowed into the Adriatic Sea marking the boundary between the Roman province of Gaul and the Roman heartland. Its crossing by Julius Caesar in 49 B.C.E. began a civil war.
2. The same river in the present day, identified with a river previously named Fiumicino.
3. A locality in the Shire of Murrindindi, central eastern Victoria, Australia.

## Etymology
From Latin Rubicō, Rubicōn (“the Rubicon”), possibly from rubeus (“red, reddish”), from rubeō (“to be red”), ultimately from Proto-Indo-European *h₁rewdʰ- (“red”), an allusion to the colour of the river caused by mud deposits.

## Easily confused with
- **Rubio** (https://plainspell.com/en/vs/rubicon-vs-rubio)
- **Rubin** (https://plainspell.com/en/vs/rubicon-vs-rubin)
- **Robison** (https://plainspell.com/en/vs/robison-vs-rubicon)

## Common misspellings (10)
`rbuicon`, `rrubicon`, `rubbicon`, `rubcion`, `rubiccon`, `rubicno`, `rubiconn`, `rubiocn`, `ruibcon`, `urbicon`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/rubicon