Quite possibly the most determined Anime faction of all time. Beginning their saga with Mobile Suit Gundam, Zeon forces have been defeated after coming back yet again in close to half of all Mobile Suit Gundam spin-offs. The faction itself is basically the Nazis in space, with each new series trying to make it even more clear (Until the latest Gundam series, Gundam Unicorn which abandoned subtlety altogether and just gave their giant robots Nazi helmets and weaponry). Zeon began as a movement to liberate the space colonies from the rule of the Earth Federation and create an independent nation in space. However, their rulers read a little bit too much of 'Mein Kampf' and decided to go on sprees of what many of us refer to as 'War Crimes', even going so far as to gas a colony full of civilians and then drop the thing onto the earth, resulting in a crater over 500 miles wide. Then they did that a few more times. Point is, they like making things explode and their leaders tend not to have too strong a grasp on this whole 'Morality' thing everyone keeps going on about. Despite the fact that the producers keep trying to make them evil, the fanbase of Zeon seems to be larger than that of the federation. More than likely this is because they always get the cool toys and tend to have more badass characters. Like Char, the Red Comet who manages to be one of Anime's most memorable villains.
The Principality of Zeon are the main antagonists the Universal Century

Zeon has most the cool Mobile Suits, like the Zaku.

Man, I can't believe Zeon's back again. This is the third time this week!
by Ribbits May 26, 2011
A very beautiful girl with a gorgeous smile and an amazing personality. She is also very weird and funny there is never a dull moment with her around.
Why can't that girl be more like Zeon ?
by Qwertyqq June 3, 2016
A group of vigorous and nationalist space nazis who have a bit of trouble not dropping colonies on planets (note Neo Zeon as well.) They fly or walk around in some cyclops tanks, Zakus, or some weird amalgamations of their own creation, like Agguguy. Originally run by some insane family called the Zabis, some bitchface called Haman took over, and then the douchebag that killed the Zabis then took over to drop some more stuff on planets, and then his ghost or something wanted a box.
“Did you see those Zeon guys in action?”

“Yeah, Zakus scare the shit out of me.”
by BuckymanBTown November 12, 2018
A demon from the anime/manga series Konjiki no Gash that uses lightning as well as various forms of telepathy and the ability to create creatures out of strands of hair. Partnered to Dufaux and known for his strong hatred of Gash Bell, Zeon is also known for his cloak which is like "a living amoeba."
Zeon burned Ropes' book in Holand.

"I will defeat Zeon!"

Zeon hates Gash.
by A Gash Bell Fan July 13, 2006
Military power of outer space side 3 in the show mobile suit gundam. oh Btw they own!
"Sieg Zeon!"

Garma- "Char is r0x0rin it up wit da zeon, you be siegin dat?"

Gerin- "Word g funk money, now lets hit up earth wit dat bad azz invasiOn."

Garma- "w00t nigga."
by Lord Aznable December 19, 2003
"d00d I so zeoned that bitch"
"I seriously zeon your mom!"
by Lord Aznable December 19, 2003
oh my g-d. that admissions interview took a zeon.
by ultra light January 10, 2012