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4.
A person with the same name as you, who is in an environment where out-doing eachother becomes necessary.
"Shit! My arch-nemesis (the other Diego) beat me in our last maths test."
"That other Diego is alwayz competing for promotions against me at work."
"I hate this new Diego that has started hanging out with us, everyone thinks he's so cool."
by Diego September 05, 2003
 
1.
Arch nemesis are friends from a long time ago that have more or less equivalent powers, but also have oposing ideologies. They are therefore always fighting with each other. Examples:
- Obi Wan and Darth Vader
- The Republican and Democratic Parties
Professor Xavier and Magneto are eachother's arch-nemesis. They play chess together and have been friends for a long time, but they completely disagree about the relationship that mutants should have with humans, so they are always fighting.
by David Aaron Smith May 20, 2007
 
2.
Someone for whom you have no respect and generally hate. Seeing something bad happen to him should make you happy.
Not to be confused with Rival
TNT is the archnemesis of Anakin
Bush is the archnemesis of the world
by TNT November 18, 2004
 
3.
when playing dice, rolling two of the three dice first and getting a 5 and a 2, as this roll has been responsible for the losses of many large pots when the third roll was another 5. originated in moorpark, ca along with terms such as secondary nemisis, dice dont lie, universe, and mmmm yes languages.
nathan rolls dice: a 5...and a 2? oh no! ARCH NEMESIS!! i hope this last dice isnt a 5 so i dont win 780 dollars!
by ech0es March 09, 2008