All 4 Uses

revelation
in
War and Peace
(Edited)

Let us try to conform to them and follow them, and let us be persuaded that the less we let our feeble human minds roam, the better we shall please God, who rejects all knowledge that does not come from Him; and the less we seek to fathom what He has been pleased to conceal from us, the sooner will He vouchsafe its revelation to us through His divine Spirit.
Chpt 1 *

revelation = something previously unknown; or making such a thing known
Theology stood on guard for the old views and accused the new of violating revelation.
Chpt 15
Just as prolonged and stubborn is the struggle now proceeding between the old and the new conception of history, and theology in the same way stands on guard for the old view, and accuses the new view of subverting revelation.
Chpt 15

Uses with a meaning too rare to warrant foucs:

One of his brother Masons had revealed to Pierre the following prophecy concerning Napoleon, drawn from the Revelation of St. John.
Chpt 9 *

revelation = a book in the Christian and Hebrew Bibles

Definitions:

(1) (revelation)
something that was previously unknown (and typically surprising); or making such a thing known
(2) (meaning too rare to warrant focus)
As a proper noun, Revelation refers to the last book of the Bible with visionary descriptions of the End of Days. It can also refer to things revealed religiously rather than via logic.