Where does “undicesimo” come from?

undicesimo (Italian) comes from Italian -èsimo, from Latin -ismus, from Ancient Greek -ισμός, from Ancient Greek -μός, from Proto-Indo-European -mós — Creates action/result nouns from verb stems.

undicesimo (Italian): eleventh

Definitions

eleventh

Ancestry of “undicesimo”, step by step

Step	Language	Word	Meaning
1	Italian	-èsimo	th used to form ordinal numbers
2	Latin	-ismus	-ism
3	Ancient Greek	-ισμός	Forms abstract nouns
4	Ancient Greek	-μός	Forms abstract nouns
5	Proto-Indo-European	-mós	Creates action/result nouns from verb stems

Every word from Proto-Indo-European -mós →Every word from Ancient Greek -μός →Every word from Ancient Greek -ισμός →