Reveal comes from Latin revēlāre — literally 'to pull back the veil'. Revelation and apocalypse are the same word in different languages: both mean 'to uncover what was hidden'.
To make something previously secret or unknown known to others; to uncover or disclose.
From Old French reveler, from Latin revēlāre meaning 'to unveil, to uncover, to lay bare', composed of re- 'back, opposite of' + vēlāre 'to cover, to veil', from vēlum meaning 'a covering, a curtain, a sail'. To reveal is literally to pull back the veil. The same Latin root gives us veil, velvet (a veiled, soft fabric), and the Apocalypse — from Greek apokalypsis, which is the exact Greek equivalent of Latin revēlāre: apo- 'away from' + kalyptein 'to cover'. Revelation and apocalypse are
Revelation and apocalypse are the same word in different languages. Latin revēlāre ('to unveil') and Greek apokalypsis ('to uncover') both mean 'to pull back the covering'. The Book of Revelation is called the Apocalypse in Greek traditions — same meaning, same metaphor, different tongues. To reveal and to apocalypse are, etymologically, identical acts.