Where does “číselný” come from?
číselný (Czech) comes from Czech číslo, from Proto-Slavic čislo, from Proto-Slavic čisti, from Proto-Balto-Slavic (s)keistéi, from Proto-Indo-European *(s)kʷéyt-t ~ *(s)kit-ént, from Proto-Indo-European kʷeyt- — to notice; to read.
číselný (Czech): numerical
Ancestry of “číselný”, step by step