Where does “tredecennis” come from?

tredecennis (Latin) comes from Latin tredecim, from Latin decem, from Latin -nus, from Proto-Italic -nos, from Proto-Indo-European -nós — Creates verbal adjectives from roots.

Ancestry of “tredecennis”, step by step

tredecennis traces back through two separate lines of ancestry.

via Latin tredecim

Step	Language	Word	Meaning
1	Latin	tredecim	thirteen; 13
2	Latin	decem	ten; 10
3	Latin	-nus	-an
4	Proto-Italic	-nos	Creates verbal adjectives from verb stems
5	Proto-Indo-European	-nós	Creates verbal adjectives from roots

via Latin annus

Step	Language	Word	Meaning
1	Latin	annus	year; time; season
2	Proto-Italic	atnos	year
3	Proto-Indo-European	h₂et-no-	—
4	Proto-Indo-European	h₂et-	grass

Words derived from “tredecennis”

tredennis

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