revelation (n.) Look up revelation at Dictionary.com
c.1300, "disclosure of information to man by a divine or supernatural agency," from Old French revelacion, from Latin revelationem (nominative revelatio), from revelatus, past participle of revelare (see reveal). General meaning "disclosure of facts" is attested from late 14c.; meaning "striking disclosure" is from 1862. As the name of the last book of the New Testament (Revelation of St. John), it is first attested c.1400 (see apocalypse); as simply Revelations, it is first recorded 1690s.