Where does “сторіччя” come from?

сторіччя (Ukrainian) comes from Ukrainian сто, from Proto-Slavic sъto, from Proto-Balto-Slavic śímta, from Proto-Indo-European ḱm̥tóm, from Proto-Indo-European déḱm̥ — ten.

Ancestry of “сторіччя”, step by step

сторіччя traces back through two separate lines of ancestry.

via Ukrainian сто

StepLanguageWordMeaning
1Ukrainianстоhundred
2Proto-Slavicsъtohundred
3Proto-Balto-Slavicśímtahundred
4Proto-Indo-Europeanḱm̥tómhundred
5Proto-Indo-Europeandéḱm̥ten

via Ukrainian рік

StepLanguageWordMeaning
1Ukrainianрікyear time it takes for the Earth to complete one revolution of the Sun
2Old East Slavicрокъ—
3Proto-Slavicrokъtime, term; year
4Proto-Slavicreťito say
Every word from Proto-Indo-European déḱm̥ →Every word from Proto-Indo-European ḱm̥tóm →Every word from Proto-Balto-Slavic śímta →