Where does “duodecennis” come from?

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

duodecennis (Latin): twelve years old

Definitions

twelve years old

Ancestry of “duodecennis”, step by step

duodecennis traces back through two separate lines of ancestry.

via Latin duodecim

Step	Language	Word	Meaning
1	Latin	duodecim	twelve; 12; dozen
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 “duodecennis”

duodecennial
duodennis
duodecennium

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