Where does “plnoletost” come from?
plnoletost (Czech) comes from Czech plnoletý, from Czech plný, from Old Czech plný, from Proto-Slavic pьlnъ, from Proto-Balto-Slavic pílˀnas, from Proto-Indo-European pl̥h₁nós, from Proto-Indo-European pleh₁- — to fill.
plnoletost (Czech): age
Ancestry of “plnoletost”, step by step