From Wiktionary, the free dictionary
Morphologically from пяле (päle, “half”) + -с (-s, “[illative]”).
пялес • (päles)
- indefinite singular illative of пяле (päle)
пялес • (päles)
- in half
- V. I. Ščankina (2011) Russko-mokšansko-erzjanskij slovarʹ [Russian-Moksha-Erzya Dictionary], Saransk, →ISBN
наполовину — пялева, пялес- napolovinu — päleva, päles
- in half [in Russian] — in half