Aletheia means unveiled mystery, not secret, disclosed facts and intentions, how something works and how it does not work, how it does exist and how it does not exist.
"To say of what is that it is not, or of what is not that it is, is ψεῦδος, while to say of what is that it is, and of what is not that it is not, is αληθές" - Aristotle 1011b27
Martin Heidegger "To raise the question of aletheia, of disclosure as such, is not the same as raising the question of truth. For this reason, it was inadequate and misleading to call aletheia, in the sense of opening, truth."
"ἀ–λήθεια, uses the privative ἀ; letheia (λήθεια) is semantically connected to the Hadean river of forgetfulness lethe (λήθε), and of oblivion, it also underlies the Latin lateo, 'am hidden', 'remain unnoticed', from which English derives 'latent'.now the sanskrit vowel अ is related to the greek ἀ, and is also used as a privative in Sanskrit."
Are there any other (philosopher's) works about the term except that of Heidegger?