n.1 a the act or an instance of revealing, esp. the supposed disclosure of knowledge to humankind by a divine or supernatural agency. b knowledge disclosed in this way.
2 a striking disclosure (it was a revelation to me).
3 (Revelation or colloq. Revelations) (in full the Revelation of St John the Divine) the last book of the New Testament, describing visions of heaven.
Derivatives:
revelational adj.
Etymology: ME f. OF revelation or LL revelatio (as REVEAL(1))