All 12 Uses of

revelation
in
The Scarlet Letter

Some authors, indeed, do far more than this, and indulge themselves in such confidential depths of revelation as could fittingly be addressed only and exclusively to the one heart and mind of perfect sympathy; as if the printed book, thrown at large on the wide world, were certain to find out the divided segment of the writer's own nature, and complete his circle of existence by bringing him into communion with it.
p. 5.9

revelation = something previously unknown; or making such a thing known

Then after long search into the minister's dim interior, and turning over many precious materials, in the shape of high aspirations for the welfare of his race, warm love of souls, pure sentiments, natural piety, strengthened by thought and study, and illuminated by revelation—all of which invaluable gold was perhaps no better than rubbish to the seeker—he would turn back, discouraged, and begin his quest towards another point.
p. 120.2

But what shall we say, when an individual discovers a revelation addressed to himself alone, on the same vast sheet of record.
p. 143.8

THE REVELATION OF THE SCARLET LETTER.
p. 231.0

revelation = revealing of something previously unknown

But it were irreverent to describe that revelation.
p. 238.2

revelation = something previously unknown; or making such a thing known

The angel and apostle of the coming revelation must be a woman, indeed, but lofty, pure, and beautiful, and wise; moreover, not through dusky grief, but the ethereal medium of joy; and showing how sacred love should make us happy, by the truest test of a life successful to such an end.
p. 245.6

if such revelations be received without tumult, and acknowledged not so often by an uttered sympathy as by silence, an inarticulate breath, and here and there a word to indicate that all is understood;†
p. 115.2

No; these revelations, unless I greatly err, are meant merely to promote the intellectual satisfaction of all intelligent beings, who will stand waiting, on that day, to see the dark problem of this life made plain.†
p. 121.8

Nothing was more common, in those days, than to interpret all meteoric appearances, and other natural phenomena that occurred with less regularity than the rise and set of sun and moon, as so many revelations from a supernatural source.†
p. 143.3

All these giant trees and boulders of granite seemed intent on making a mystery of the course of this small brook; fearing, perhaps, that, with its never-ceasing loquacity, it should whisper tales out of the heart of the old forest whence it flowed, or mirror its revelations on the smooth surface of a pool.†
p. 173.2

Definitions:

(1) (revelation)
something that was previously unknown (and typically surprising); or making such a thing known
(2) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

Less commonly, Revelation as a proper noun refers to the last book of the Bible with visionary descriptions of the End of Days. Less commonly still, it sometimes refers to things revealed religiously rather than via logic.