Where does “kvinono” come from?

kvinono (Esperanto) comes from Esperanto kvin, from Latin quīnque, from Proto-Italic kʷenkʷe, from Proto-Indo-European pénkʷe — five.

kvinono (Esperanto): a fifth

Definitions

Step	Language	Word	Meaning
1	Esperanto	kvin	five
2	Latin	quīnque	—
3	Proto-Italic	kʷenkʷe	five
4	Proto-Indo-European	pénkʷe	five

kvinono — Etymology, Origin & Word History | Etymology Explorer