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1.
this is the name of the first Gundam seen( non-SD universe) with a physical sword, arguably one of the most badass mobile suits ever created, it carried 7 swords 4 of which were geam sabers and 3 of which were physical, the arm mounted GN sword-rifle, like the name suggests could alternate between being a sword and a rifle, it was specifically designed to combat other Gundam type mobile suits that were capabe of creating a GN field, or energy shield using the GN solar furnaces
"Gundam Exia, exterminating the targets" Setsuna F. Seiei, pilot of the Gundam Exia
by NZG-BLADE-069 June 15, 2011
 
2.
A creature of darkness; this person has a past filled with regret and sadness.
Exia is someone who has lost everything that was important to that person and is now completely emotionless.
by Neo Organization November 12, 2010
 
3.
A lying hacking cheat who has been proven to have hacked and stolen currency from a website. Best known as a fat kid who sits around trying to harass many people via the internet and IMVU.com
Also known as a 3D developer wanabee.
Exium is a dirty little hacking son of a bitch who sucks at 3D development.
by Mr. Skittles June 13, 2006