Where does “мьгновениѥ” come from?

мьгновениѥ (Old Church Slavonic) comes from Proto-Slavic *mьgnovenьje, from Proto-Slavic *mьgnǫti, from Proto-Slavic migati, from Proto-Balto-Slavic meyg-, from Proto-Indo-European meygʰ-.

Ancestry of “мьгновениѥ”, step by step

StepLanguageWordMeaning
1Proto-Slavic*mьgnovenьjemoment, instant, twinkling
2Proto-Slavic*mьgnǫti
3Proto-Slavicmigatito blink
4Proto-Balto-Slavicmeyg-
5Proto-Indo-Europeanmeygʰ-
Every word from Proto-Indo-European meygʰ-Every word from Proto-Balto-Slavic meyg-Every word from Proto-Slavic migati