Where does “quinzièmement” come from?

quinzièmement (French) comes from French quinzième, from French quinze, from Middle French quinze, from Latin quindecim, from Latin decem, from Latin -nus, from Proto-Italic -nos, from Proto-Indo-European -nós — Creates verbal adjectives from roots.

quinzièmement (French): fifteenthly

Definitions

fifteenthly

Ancestry of “quinzièmement”, step by step

Step	Language	Word	Meaning
1	French	quinzième	fifteenth
2	French	quinze	fifteen
3	Middle French	quinze	fifteen
4	Latin	quindecim	fifteen; 15
5	Latin	decem	ten; 10
6	Latin	-nus	-an
7	Proto-Italic	-nos	Creates verbal adjectives from verb stems
8	Proto-Indo-European	-nós	Creates verbal adjectives from roots

Every word from Proto-Indo-European -nós →Every word from Latin -nus →Every word from Latin decem →