A prophetic revelation, especially concerning a cataclysm in which the forces of good permanently triumph over the forces of evil.  From the Greek word apocalupsis, meaning to “uncover” or “disclose” some new revelation.  It is The technical name of the Book of Revelation, which is based on the first Greek word appearing in that book.  The Greek apokalypsis is a compound of apo (“from”) and kalypsis (“hidden”), meaning “uncover, reveal, open up.” (The Apocalypse of Jesus Christ).