The end of the world or a catastrophic disaster, especially the end times described in religious texts like the Bible.
From Greek 'apokalypsis' meaning 'unveiling' or 'revelation' (apo- = away, kalyptein = to hide). Originally referred to divine revelations of future events, particularly the Book of Revelation in the Bible, which described end times in vivid detail.
Apocalypse doesn't actually mean 'end of the world' in its original Greek—it meant 'unveiling' or 'revealing,' so it originally described the unveiling of God's plan for the future, especially the dramatic end times!
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