-է

Meillet has cautiously derived from a Proto-Indo-European adverbial morpheme *-tes, comparing to adverbial forms such as Sanskrit मुखतस् (mukha-tás, “from the mouth”), Latin fundi-tus (“from the foundation, utterly”), in-tus (“from the inside”). Alternatively, has been paralleled with Anatolian ablative instrumental endings: Luwian [script needed] (-ati), Lycian [script needed] (-edi, -adi). Yet another proposal going back to Bugge derives this from Proto-Indo-European *éti.

-է • (-ē)

1. singular ablative case marker in several declension types

   շանէ ― šanē ― ablative singular of շուն (šun)

• Matasović, Ranko (2009) A Grammatical Sketch of Classical Armenian‎ (pdf), Zagreb, page 18
• Godel, Robert (1975) An introduction to the study of classical Armenian, Wiesbaden: Dr. Ludwig Reichert Verlag, page 105