1 (the Apocalypse) Revelation, the last book of the New Testament, recounting a divine revelation to St John.
2 a revelation, esp. of the end of the world.
3 a grand or violent event resembling those described in the Apocalypse.
Etymology: ME f. OF ult. f. Gk apokalupsis f. apokalupto uncover, reveal
Useful english dictionary. 2012.