Definition of "revealment"

I know Marianne's heart: I know that she dearly loves me, and that I shall not be the last to whom the affair is made known, when circumstances make the revealment of it eligible.

1811, [Jane Austen], chapter XVI, in Sense and Sensibility […], volume I, London: […] C[harles] Roworth, […], and published by T[homas] Egerton, […], page 198

Alas! how much guile did that seeming desperation hide, which, as the result has now shown, though it may have come from the heart, never afterward returned to the same, and made manifest later that its revealment on the face was only a lure and a delusion!

1907, James C. Brogan, La Fiammetta‎

Autobiography […] inevitably consists mainly of extinctions of the truth, shirkings of the truth, partial revealments of the truth, with hardly an instance of plain straight truth […]

1906-1907, Mark Twain, Chapters from My Autobiography

And it's the teasing game of psychological revealment and concealment that makes Dorian Gray such a gripping tale more than a century after its publication.

1997 April 11, Albert Williams, “One-Dimentional Portrait”, in Chicago Reader‎