(noun)
something that has been revealed prophetically, especially the final battle between the forces of good and evil (Armageddon);
e.g. The conflict has made a nuclear apocalypse seem imminent.
(noun)
the final and complete destruction of the world, involving the ruling powers of evil being destroyed by God, according to a religious text/scripture in Judaism and Christianity (often used as "the Apocalypse"), or the scripture that describes this;
e.g. They believe that this is a sign that the Apocalypse is approaching.