Learn how to say Apocalypse correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word apocalypse:
1 (often the Apocalypse) the complete final destruction of the world, as described in the biblical book of Revelation:
the bell’s ringing is supposed to usher in the Apocalypse
(the Apocalypse) (especially in the Vulgate Bible) the book of Revelation.
2an event involving destruction or damage on a catastrophic scale:
the apocalypse of World War II
the Four Horsemen of the Apocalypse
four allegorical mounted figures, commonly identified as Pestilence (or Conquest), War, Famine, and Death, whose arrival heralds the end of the world, as described in the biblical book of Revelation.
used to refer to people or phenomena seen as agents of imminent catastrophe:
in 2003, the airline industry survived the four horsemen of the apocalypse
Old English, via Old French and ecclesiastical Latin from Greek apokalupsis, from apokaluptein ‘uncover, reveal’, from apo- ‘un-‘ + kaluptein ‘to cover’