Definition: Apocalypse refers to a predicted worldwide event or catastrophe, often referred to as the end of the world according to Christians. The term literally means "annihilation," referring to the destruction of all living beings in an eternal state of suffering and despair. The exact meaning and context vary greatly depending on the religious tradition or belief system. In Christianity, it's used to refer to a catastrophic event that could occur anywhere at any time; specifically, the end of the world as we know it.