Sat (Sanskrit: सत्):
is a Sanskrit adjective meaning "the ideal; pure and true essence (nature)" of an entity or existence in the Vedanta. It can thus be concluded as "the self-existent or Universal Spirit, Brahman".
It can simply be said to be the present participle of the root as "to be" (cognate to English is).
Thus Sat is Being - at least linguistically.
Heidegger term Sein, linguistically, the verb to be, is usually translated as Being, its present participle.
Now, Aletheia (ἀλήθεια):
is a Greek word variously translated as "unclosedness", "unconcealedness", "disclosure" or "truth". The literal meaning of the word ἀ–λήθεια is "the state of not being hidden; the state of being evident" and it also implies sincerity, as well as factuality or reality.
Famously, Heidegger unconcealed aletheia; one can say he removed the privative.
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.
Is there then, a Sanskrit term which matches or overlaps letheia linguistically & semantically?
Given the semantic overlap in the Greek & Latin - one rather suspects that there should be.