Where does “quatren” come from?

quatren (Occitan) comes from Occitan quatre, from Old Occitan quatre, from Latin quattŭor, from Portuguese quarto, from Old Portuguese quarto, from Latin quārtus, from Proto-Indo-European kʷeturtos, from Proto-Indo-European kʷetwóres — and.

quatren (Occitan): fourth

Definitions

fourth

Ancestry of “quatren”, step by step

Step	Language	Word	Meaning
1	Occitan	quatre	four
2	Old Occitan	quatre	—
3	Latin	quattŭor	four; 4
4	Portuguese	quarto	ordinal form of quatro; fourth; quarter; fourth;...
5	Old Portuguese	quarto	quarter
6	Latin	quārtus	fourth
7	Proto-Indo-European	kʷeturtos	—
8	Proto-Indo-European	kʷetwóres	four
9	Proto-Indo-European	kʷe-	and

Every word from Proto-Indo-European kʷe- →Every word from Proto-Indo-European kʷetwóres →Every word from Proto-Indo-European kʷeturtos →