revelation (n.)

c. 1300, "disclosure of information to man by a divine or supernatural agency," from Old French revelacion and directly from Latin revelationem (nominative revelatio), noun of action from past participle stem of revelare "unveil, uncover, lay bare" (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 late 14c. (see apocalypse); as simply Revelations, it is first recorded 1690s.

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Definitions of revelation from WordNet
revelation (n.)
the speech act of making something evident;
Synonyms: disclosure / revealing
revelation (n.)
an enlightening or astonishing disclosure;
revelation (n.)
communication of knowledge to man by a divine or supernatural agency;
Synonyms: divine revelation
Revelation (n.)
the last book of the New Testament; contains visionary descriptions of heaven and of conflicts between good and evil and of the end of the world; attributed to Saint John the Apostle;
Synonyms: Revelation of Saint John the Divine / Apocalypse / Book of Revelation