Where does “багатолітній” come from?

багатолітній (Ukrainian) comes from Ukrainian багато-, from Ukrainian бага́то, from Ukrainian бага́тий, from Ukrainian -і́й, from Latin -ium, from Latin -ius, from Proto-Italic -jōs, from Proto-Indo-European -yós — Creates adjectives from noun or verb stems.

Ancestry of “багатолітній”, step by step

StepLanguageWordMeaning
1Ukrainianбагато-many-, multi-, poly- pertaining to many
2Ukrainianбага́тоwhen quantifying a noun}} much, a lot
3Ukrainianбага́тийrich, wealthy
4Ukrainian-і́йer, -or, -ist
5Latin-iumSuffix used to form abstract nouns, sometimes...
6Latin-iusforming adjectives from nouns; nominative neuter...
7Proto-Italic-jōsForms comparative adjectives
8Proto-Indo-European-yósCreates adjectives from noun or verb stems
Every word from Proto-Indo-European -yósEvery word from Latin -iumEvery word from Latin -ius