Peace is when you can finally put down your arms and relax. It's like, you know, when the war is over.
But what is the definition of war, you ask? Well, it's like, when the neighbors' kids keep playing their music too loud, and you just really, really, REALLY want to kill them.
So, you see, peace is like, the opposite of that. Like, the feeling of calm, the stillness, the... wait, no, that's not right. The feeling of calm is when your cat's hairball lands on your favorite sweater.
Anyway, let's just stick with the first definition, shall we?