Where does “treizièmement” come from?

treizièmement (French) comes from French treizième, from French treize, from Middle French treize, from Old French treize, from Latin tredecim, from Latin decem, from Latin -nus, from Proto-Italic -nos — Creates verbal adjectives from roots.

treizièmement (French): thirteenthly

Definitions

thirteenthly

Ancestry of “treizièmement”, step by step

Step	Language	Word	Meaning
1	French	treizième	thirteenth
2	French	treize	thirteen
3	Middle French	treize	—
4	Old French	treize	—
5	Latin	tredecim	thirteen; 13
6	Latin	decem	ten; 10
7	Latin	-nus	-an
8	Proto-Italic	-nos	Creates verbal adjectives from verb stems
9	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 →